diff --git a/src/b_game.cpp b/src/b_game.cpp
index 9681aa7a80..9d6419787e 100644
--- a/src/b_game.cpp
+++ b/src/b_game.cpp
@@ -494,7 +494,7 @@ bool FCajunMaster::LoadBots ()
 	tmp = M_GetCajunPath(BOTFILENAME);
 	if (tmp.IsEmpty())
 	{
-		DPrintf ("No " BOTFILENAME ", so no bots\n");
+		DPrintf (DMSG_ERROR, "No " BOTFILENAME ", so no bots\n");
 		return false;
 	}
 	try
diff --git a/src/c_console.cpp b/src/c_console.cpp
index 9a9274aa16..850a29455d 100644
--- a/src/c_console.cpp
+++ b/src/c_console.cpp
@@ -612,12 +612,12 @@ int Printf (const char *format, ...)
 	return count;
 }
 
-int DPrintf (const char *format, ...)
+int DPrintf (int level, const char *format, ...)
 {
 	va_list argptr;
 	int count;
 
-	if (developer)
+	if (developer >= level)
 	{
 		va_start (argptr, format);
 		count = VPrintf (PRINT_HIGH, format, argptr);
diff --git a/src/compatibility.cpp b/src/compatibility.cpp
index 5bb51129a4..24897ac270 100644
--- a/src/compatibility.cpp
+++ b/src/compatibility.cpp
@@ -399,7 +399,7 @@ void CheckCompatibility(MapData *map)
 
 	flags = BCompatMap.CheckKey(md5);
 
-	if (developer)
+	if (developer >= DMSG_NOTIFY)
 	{
 		Printf("MD5 = ");
 		for (size_t j = 0; j < sizeof(md5.Bytes); ++j)
diff --git a/src/d_dehacked.cpp b/src/d_dehacked.cpp
index 29a087facd..4beb5c25a5 100644
--- a/src/d_dehacked.cpp
+++ b/src/d_dehacked.cpp
@@ -450,7 +450,7 @@ int FindStyle (const char *namestr)
 	{
 		if (!stricmp(StyleNames[i].Name, namestr)) return StyleNames[i].Num;
 	}
-	DPrintf("Unknown render style %s\n", namestr);
+	DPrintf(DMSG_ERROR, "Unknown render style %s\n", namestr);
 	return -1;
 }
 
@@ -861,7 +861,7 @@ static int PatchThing (int thingy)
 	}
 	else
 	{
-		DPrintf ("Thing %d\n", thingy);
+		DPrintf (DMSG_SPAMMY, "Thing %d\n", thingy);
 		if (thingy > 0)
 		{
 			type = InfoNames[thingy - 1];
@@ -1086,7 +1086,7 @@ static int PatchThing (int thingy)
 						}
 						if (i == BitNames.Size())
 						{
-							DPrintf("Unknown bit mnemonic %s\n", strval);
+							DPrintf(DMSG_ERROR, "Unknown bit mnemonic %s\n", strval);
 						}
 					}
 				}
@@ -1242,7 +1242,7 @@ static int PatchThing (int thingy)
 					else
 						info->renderflags &= ~RF_INVISIBLE;
 				}
-				DPrintf ("Bits: %d,%d (0x%08x,0x%08x)\n", info->flags.GetValue(), info->flags2.GetValue(),
+				DPrintf (DMSG_SPAMMY, "Bits: %d,%d (0x%08x,0x%08x)\n", info->flags.GetValue(), info->flags2.GetValue(),
 													      info->flags.GetValue(), info->flags2.GetValue());
 			}
 			else if (stricmp (Line1, "ID #") == 0)
@@ -1328,7 +1328,7 @@ static int PatchSound (int soundNum)
 {
 	int result;
 
-	DPrintf ("Sound %d (no longer supported)\n", soundNum);
+	//DPrintf ("Sound %d (no longer supported)\n", soundNum);
 /*
 	sfxinfo_t *info, dummy;
 	int offset = 0;
@@ -1385,7 +1385,7 @@ static int PatchFrame (int frameNum)
 	info = FindState (frameNum);
 	if (info)
 	{
-		DPrintf ("Frame %d\n", frameNum);
+		DPrintf (DMSG_SPAMMY, "Frame %d\n", frameNum);
 		if (frameNum == 47)
 		{ // Use original tics for S_DSGUNFLASH1
 			tics = 5;
@@ -1487,7 +1487,7 @@ static int PatchSprite (int sprNum)
 
 	if ((unsigned)sprNum < OrgSprNames.Size())
 	{
-		DPrintf ("Sprite %d\n", sprNum);
+		DPrintf (DMSG_SPAMMY, "Sprite %d\n", sprNum);
 	}
 	else
 	{
@@ -1534,7 +1534,7 @@ static int PatchAmmo (int ammoNum)
 
 	if (ammoNum >= 0 && ammoNum < 4 && (unsigned)ammoNum <= AmmoNames.Size())
 	{
-		DPrintf ("Ammo %d.\n", ammoNum);
+		DPrintf (DMSG_SPAMMY, "Ammo %d.\n", ammoNum);
 		ammoType = AmmoNames[ammoNum];
 		if (ammoType != NULL)
 		{
@@ -1617,7 +1617,7 @@ static int PatchWeapon (int weapNum)
 		if (type != NULL)
 		{
 			info = (AWeapon *)GetDefaultByType (type);
-			DPrintf ("Weapon %d\n", weapNum);
+			DPrintf (DMSG_SPAMMY, "Weapon %d\n", weapNum);
 		}
 	}
 
@@ -1757,7 +1757,7 @@ static int PatchPointer (int ptrNum)
 		{
 			if (CodePConv[ptrNum] == indexnum) break;
 		}
-		DPrintf("Final ptrNum: %i\n", ptrNum);
+		DPrintf(DMSG_SPAMMY, "Final ptrNum: %i\n", ptrNum);
 	}
 	// End of hack.
 
@@ -1765,7 +1765,7 @@ static int PatchPointer (int ptrNum)
 	// Better to just use the size of the array rather than a hardcoded value.
 	if (ptrNum >= 0 && (unsigned int) ptrNum < CodePConv.Size())
 	{
-		DPrintf ("Pointer %d\n", ptrNum);
+		DPrintf (DMSG_SPAMMY, "Pointer %d\n", ptrNum);
 	}
 	else
 	{
@@ -1789,7 +1789,7 @@ static int PatchPointer (int ptrNum)
 				{
 					SetPointer(state, Actions[index], CodePConv[ptrNum]);
 				}
-				DPrintf("%s has a hacked state for pointer num %i with index %i\nLine1=%s, Line2=%s\n", 
+				DPrintf(DMSG_SPAMMY, "%s has a hacked state for pointer num %i with index %i\nLine1=%s, Line2=%s\n", 
 					state->StaticFindStateOwner(state)->TypeName.GetChars(), ptrNum, index, Line1, Line2);
 			}
 			else
@@ -1806,7 +1806,7 @@ static int PatchCheats (int dummy)
 {
 	int result;
 
-	DPrintf ("Cheats (support removed by request)\n");
+	DPrintf (DMSG_NOTIFY, "Dehacked cheats support removed by request\n");
 
 	while ((result = GetLine ()) == 1)
 	{
@@ -1836,7 +1836,7 @@ static int PatchMisc (int dummy)
 	};
 	int result;
 
-	DPrintf ("Misc\n");
+	DPrintf (DMSG_SPAMMY, "Misc\n");
 
 	while ((result = GetLine()) == 1)
 	{
@@ -2017,7 +2017,7 @@ static int PatchPars (int dummy)
 	level_info_t *info;
 	int result, par;
 
-	DPrintf ("[Pars]\n");
+	DPrintf (DMSG_SPAMMY, "[Pars]\n");
 
 	while ( (result = GetLine()) ) {
 		// Argh! .bex doesn't follow the same rules as .deh
@@ -2058,7 +2058,7 @@ static int PatchPars (int dummy)
 		}
 
 		info->partime = par;
-		DPrintf ("Par for %s changed to %d\n", mapname, par);
+		DPrintf (DMSG_SPAMMY, "Par for %s changed to %d\n", mapname, par);
 	}
 	return result;
 }
@@ -2067,7 +2067,7 @@ static int PatchCodePtrs (int dummy)
 {
 	int result;
 
-	DPrintf ("[CodePtr]\n");
+	DPrintf (DMSG_SPAMMY, "[CodePtr]\n");
 
 	while ((result = GetLine()) == 1)
 	{
@@ -2132,7 +2132,7 @@ static int PatchMusic (int dummy)
 {
 	int result;
 
-	DPrintf ("[Music]\n");
+	DPrintf (DMSG_SPAMMY, "[Music]\n");
 
 	while ((result = GetLine()) == 1)
 	{
@@ -2142,7 +2142,7 @@ static int PatchMusic (int dummy)
 		keystring << "MUSIC_" << Line1;
 
 		GStrings.SetString (keystring, newname);
-		DPrintf ("Music %s set to:\n%s\n", keystring.GetChars(), newname);
+		DPrintf (DMSG_SPAMMY, "Music %s set to:\n%s\n", keystring.GetChars(), newname);
 	}
 
 	return result;
@@ -2198,7 +2198,7 @@ static int PatchText (int oldSize)
 		goto donewithtext;
 	}
 
-	DPrintf ("Searching for text:\n%s\n", oldStr);
+	DPrintf (DMSG_SPAMMY, "Searching for text:\n%s\n", oldStr);
 	good = false;
 
 	// Search through sprite names; they are always 4 chars
@@ -2264,7 +2264,7 @@ static int PatchText (int oldSize)
 
 	if (!good)
 	{
-		DPrintf ("   (Unmatched)\n");
+		DPrintf (DMSG_SPAMMY, "   (Unmatched)\n");
 	}
 		
 donewithtext:
@@ -2284,7 +2284,7 @@ static int PatchStrings (int dummy)
 {
 	int result;
 
-	DPrintf ("[Strings]\n");
+	DPrintf (DMSG_SPAMMY, "[Strings]\n");
 
 	while ((result = GetLine()) == 1)
 	{
@@ -2310,7 +2310,7 @@ static int PatchStrings (int dummy)
 		const char *ll = Line1;
 		if (!stricmp(ll, "GOTREDSKULL")) ll = "GOTREDSKUL";
 		GStrings.SetString (ll, holdstring);
-		DPrintf ("%s set to:\n%s\n", Line1, holdstring.GetChars());
+		DPrintf (DMSG_SPAMMY, "%s set to:\n%s\n", Line1, holdstring.GetChars());
 	}
 
 	return result;
@@ -2350,7 +2350,7 @@ static int DoInclude (int dummy)
 	else
 	{
 		data = Line2;
-		DPrintf ("Including %s\n", data);
+		DPrintf (DMSG_SPAMMY, "Including %s\n", data);
 		savepatchname = PatchName;
 		savepatchfile = PatchFile;
 		savepatchpt = PatchPt;
@@ -2384,7 +2384,7 @@ static int DoInclude (int dummy)
 			delete[] path;
 		}
 
-		DPrintf ("Done with include\n");
+		DPrintf (DMSG_SPAMMY, "Done with include\n");
 		PatchName = savepatchname;
 		PatchFile = savepatchfile;
 		PatchPt = savepatchpt;
@@ -2536,7 +2536,7 @@ static bool DoDehPatch()
 	}
 	else
 	{
-		DPrintf ("Patch does not have DeHackEd signature. Assuming .bex\n");
+		DPrintf (DMSG_WARNING, "Patch does not have DeHackEd signature. Assuming .bex\n");
 		dversion = 19;
 		pversion = 6;
 		PatchPt = PatchFile;
@@ -3027,7 +3027,7 @@ void FinishDehPatch ()
 			subclass->Replacement = old_replacement;
 		}
 
-		DPrintf ("%s replaces %s\n", subclass->TypeName.GetChars(), type->TypeName.GetChars());
+		DPrintf (DMSG_NOTIFY, "%s replaces %s\n", subclass->TypeName.GetChars(), type->TypeName.GetChars());
 	}
 
 	// Now that all Dehacked patches have been processed, it's okay to free StateMap.
diff --git a/src/d_net.cpp b/src/d_net.cpp
index eadd47d965..2611338679 100644
--- a/src/d_net.cpp
+++ b/src/d_net.cpp
@@ -231,7 +231,7 @@ static struct TicSpecial
 
 		specialsize = MAX(specialsize * 2, needed + 30);
 
-		DPrintf ("Expanding special size to %zu\n", specialsize);
+		DPrintf (DMSG_NOTIFY, "Expanding special size to %zu\n", specialsize);
 
 		for (i = 0; i < BACKUPTICS; i++)
 			streams[i] = (BYTE *)M_Realloc (streams[i], specialsize);
diff --git a/src/dobjtype.cpp b/src/dobjtype.cpp
index a7f07247f2..7a593c5fe3 100644
--- a/src/dobjtype.cpp
+++ b/src/dobjtype.cpp
@@ -2134,7 +2134,7 @@ bool PArray::ReadValue(FArchive &ar, void *addr) const
 		}
 		if (i < ElementCount)
 		{
-			DPrintf("Array on disk (%u) is bigger than in memory (%u)\n",
+			DPrintf(DMSG_WARNING, "Array on disk (%u) is bigger than in memory (%u)\n",
 				count, ElementCount);
 			for (; i < ElementCount; ++i)
 			{
@@ -2501,13 +2501,13 @@ bool PStruct::ReadFields(FArchive &ar, void *addr) const
 		const PSymbol *sym = Symbols.FindSymbol(FName(label, true), true);
 		if (sym == NULL)
 		{
-			DPrintf("Cannot find field %s in %s\n",
+			DPrintf(DMSG_ERROR, "Cannot find field %s in %s\n",
 				label, TypeName.GetChars());
 			SkipValue(ar);
 		}
 		else if (!sym->IsKindOf(RUNTIME_CLASS(PField)))
 		{
-			DPrintf("Symbol %s in %s is not a field\n",
+			DPrintf(DMSG_ERROR, "Symbol %s in %s is not a field\n",
 				label, TypeName.GetChars());
 			SkipValue(ar);
 		}
@@ -2806,7 +2806,7 @@ bool PClass::ReadValue(FArchive &ar, void *addr) const
 			}
 			else
 			{
-				DPrintf("Unknown superclass %s of class %s\n",
+				DPrintf(DMSG_ERROR, "Unknown superclass %s of class %s\n",
 					type->TypeName.GetChars(), TypeName.GetChars());
 				SkipValue(ar, VAL_Struct);
 			}
@@ -3243,7 +3243,7 @@ PClass *PClass::CreateDerivedClass(FName name, unsigned int size)
 		{
 			I_Error("%s must inherit from %s but doesn't.", name.GetChars(), type->ParentClass->TypeName.GetChars());
 		}
-		DPrintf("Defining placeholder class %s\n", name.GetChars());
+		DPrintf(DMSG_SPAMMY, "Defining placeholder class %s\n", name.GetChars());
 		notnew = true;
 	}
 	else
@@ -3327,7 +3327,7 @@ PClass *PClass::FindClassTentative(FName name, bool fatal)
 		return static_cast<PClass *>(found);
 	}
 	PClass *type = static_cast<PClass *>(GetClass()->CreateNew());
-	DPrintf("Creating placeholder class %s : %s\n", name.GetChars(), TypeName.GetChars());
+	DPrintf(DMSG_SPAMMY, "Creating placeholder class %s : %s\n", name.GetChars(), TypeName.GetChars());
 
 	type->TypeName = name;
 	type->ParentClass = this;
diff --git a/src/doomstat.cpp b/src/doomstat.cpp
index d693aae1b9..87ca50a168 100644
--- a/src/doomstat.cpp
+++ b/src/doomstat.cpp
@@ -39,7 +39,7 @@ FStringTable	GStrings;
 EGameSpeed		GameSpeed = SPEED_Normal;
 
 // Show developer messages if true.
-CVAR (Bool, developer, false, 0)
+CVAR (Int, developer, 0, CVAR_ARCHIVE|CVAR_GLOBALCONFIG)
 
 // [RH] Feature control cvars
 CVAR (Bool, var_friction, true, CVAR_SERVERINFO);
diff --git a/src/doomstat.h b/src/doomstat.h
index cfdca5e5a3..bbb323c7e3 100644
--- a/src/doomstat.h
+++ b/src/doomstat.h
@@ -204,7 +204,7 @@ extern	int 			bodyqueslot;
 
 
 // ---- [RH] ----
-EXTERN_CVAR (Bool, developer)
+EXTERN_CVAR (Int, developer)
 
 extern bool ToggleFullscreen;
 
diff --git a/src/doomtype.h b/src/doomtype.h
index 39c59751d3..34f750313b 100644
--- a/src/doomtype.h
+++ b/src/doomtype.h
@@ -147,7 +147,7 @@ int Printf (int printlevel, const char *, ...) GCCPRINTF(2,3);
 int Printf (const char *, ...) GCCPRINTF(1,2);
 
 // [RH] Same here:
-int DPrintf (const char *, ...) GCCPRINTF(1,2);
+int DPrintf (int level, const char *, ...) GCCPRINTF(2,3);
 
 extern "C" int mysnprintf(char *buffer, size_t count, const char *format, ...) GCCPRINTF(3,4);
 extern "C" int myvsnprintf(char *buffer, size_t count, const char *format, va_list argptr) GCCFORMAT(3);
@@ -160,15 +160,19 @@ enum
 	PRINT_MEDIUM,	// death messages
 	PRINT_HIGH,		// critical messages
 	PRINT_CHAT,		// chat messages
-	PRINT_TEAMCHAT	// chat messages from a teammate
+	PRINT_TEAMCHAT,	// chat messages from a teammate
+	PRINT_LOG,		// only to logfile
+	PRINT_BOLD = 200				// What Printf_Bold used
+};
+
+enum
+{
+	DMSG_OFF,		// no developer messages.
+	DMSG_ERROR,		// general notification messages
+	DMSG_WARNING,	// warnings
+	DMSG_NOTIFY,	// general notification messages
+	DMSG_SPAMMY,	// for those who want to see everything, regardless of its usefulness.
 };
-#define PRINT_LOW				0				// pickup messages
-#define PRINT_MEDIUM			1				// death messages
-#define PRINT_HIGH				2				// critical messages
-#define PRINT_CHAT				3				// chat messages
-#define PRINT_TEAMCHAT			4				// chat messages from a teammate
-#define PRINT_LOG				5				// only to logfile
-#define PRINT_BOLD				200				// What Printf_Bold used
 
 struct PalEntry
 {
diff --git a/src/farchive.cpp b/src/farchive.cpp
index 317abe702f..de3e248a47 100644
--- a/src/farchive.cpp
+++ b/src/farchive.cpp
@@ -354,12 +354,12 @@ void FCompressedFile::Implode ()
 		// If the data could not be compressed, store it as-is.
 		if (r != Z_OK || outlen >= len)
 		{
-			DPrintf ("cfile could not be compressed\n");
+			DPrintf (DMSG_SPAMMY, "cfile could not be compressed\n");
 			outlen = 0;
 		}
 		else
 		{
-			DPrintf ("cfile shrank from %lu to %lu bytes\n", len, outlen);
+			DPrintf (DMSG_SPAMMY, "cfile shrank from %lu to %lu bytes\n", len, outlen);
 		}
 	}
 	else
@@ -717,7 +717,7 @@ void FArchive::Close ()
 	{
 		m_File->Close ();
 		m_File = NULL;
-		DPrintf ("Processed %u objects\n", ArchiveToObject.Size());
+		DPrintf (DMSG_SPAMMY, "Processed %u objects\n", ArchiveToObject.Size());
 	}
 }
 
diff --git a/src/g_shared/a_decals.cpp b/src/g_shared/a_decals.cpp
index c37c1065a5..94e92e7258 100644
--- a/src/g_shared/a_decals.cpp
+++ b/src/g_shared/a_decals.cpp
@@ -825,13 +825,13 @@ void ADecal::BeginPlay ()
 			// without effectively doing anything.
 			if (NULL == ShootDecal(tpl, this, Sector, X(), Y(), Z(), Angles.Yaw + 180, 64., true))
 			{
-				DPrintf ("Could not find a wall to stick decal to at (%f,%f)\n", X(), Y());
+				DPrintf (DMSG_WARNING, "Could not find a wall to stick decal to at (%f,%f)\n", X(), Y());
 			}
 		}
 	}
 	else
 	{
-		DPrintf ("Decal actor at (%f,%f) does not have a good template\n", X(), Y());
+		DPrintf (DMSG_ERROR, "Decal actor at (%f,%f) does not have a good template\n", X(), Y());
 	}
 	// This actor doesn't need to stick around anymore.
 	Destroy();
diff --git a/src/i_net.cpp b/src/i_net.cpp
index 5957846d2a..e03f50a6ba 100644
--- a/src/i_net.cpp
+++ b/src/i_net.cpp
@@ -322,7 +322,7 @@ void PacketGet (void)
 		// Don't show the message for disconnect notifications.
 		if (c != 2 || TransmitBuffer[0] != PRE_FAKE || TransmitBuffer[1] != PRE_DISCONNECT)
 		{
-			DPrintf("Dropped packet: Unknown host (%s:%d)\n", inet_ntoa(fromaddress.sin_addr), fromaddress.sin_port);
+			DPrintf(DMSG_WARNING, "Dropped packet: Unknown host (%s:%d)\n", inet_ntoa(fromaddress.sin_addr), fromaddress.sin_port);
 		}
 		doomcom.remotenode = -1;
 		return;
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 0762b3e294..5f08f01526 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -1331,12 +1331,12 @@ static int CheckInventory (AActor *activator, const char *type, bool max)
 
 	if (info == NULL)
 	{
-		Printf ("ACS: I don't know what '%s' is.\n", type);
+		DPrintf (DMSG_ERROR, "ACS: '%s': Unknown actor class.\n", type);
 		return 0;
 	}
 	else if (!info->IsDescendantOf(RUNTIME_CLASS(AInventory)))
 	{
-		Printf ("ACS: '%s' is not an inventory item.\n", type);
+		DPrintf(DMSG_ERROR, "ACS: '%s' is not an inventory item.\n", type);
 		return 0;
 	}
 
@@ -2237,7 +2237,7 @@ bool FBehavior::Init(int lumpnum, FileReader * fr, int len)
 		}
 	}
 
-	DPrintf ("Loaded %d scripts, %d functions\n", NumScripts, NumFunctions);
+	DPrintf (DMSG_NOTIFY, "Loaded %d scripts, %d functions\n", NumScripts, NumFunctions);
 	return true;
 }
 
@@ -2824,7 +2824,7 @@ void FBehavior::StaticStartTypedScripts (WORD type, AActor *activator, bool alwa
 		"Disconnect",
 		"Return"
 	};
-	DPrintf("Starting all scripts of type %d (%s)\n", type,
+	DPrintf(DMSG_NOTIFY, "Starting all scripts of type %d (%s)\n", type,
 		type < countof(TypeNames) ? TypeNames[type] : TypeNames[SCRIPT_Lightning - 1]);
 	for (unsigned int i = 0; i < StaticModules.Size(); ++i)
 	{
@@ -6209,7 +6209,7 @@ int DLevelScript::RunScript ()
 			activeBehavior = savedActiveBehavior;
 			// fall through
 		case PCD_TERMINATE:
-			DPrintf ("%s finished\n", ScriptPresentation(script).GetChars());
+			DPrintf (DMSG_NOTIFY, "%s finished\n", ScriptPresentation(script).GetChars());
 			state = SCRIPT_PleaseRemove;
 			break;
 
@@ -7646,7 +7646,7 @@ scriptwait:
 			if (activationline != NULL)
 			{
 				activationline->special = 0;
-				DPrintf("Cleared line special on line %d\n", (int)(activationline - lines));
+				DPrintf(DMSG_SPAMMY, "Cleared line special on line %d\n", (int)(activationline - lines));
 			}
 			break;
 
@@ -8285,7 +8285,7 @@ scriptwait:
 					line->args[2] = STACK(3);
 					line->args[3] = STACK(2);
 					line->args[4] = STACK(1);
-					DPrintf("Set special on line %d (id %d) to %d(%d,%d,%d,%d,%d)\n",
+					DPrintf(DMSG_SPAMMY, "Set special on line %d (id %d) to %d(%d,%d,%d,%d,%d)\n",
 						linenum, STACK(7), specnum, arg0, STACK(4), STACK(3), STACK(2), STACK(1));
 				}
 				sp -= 7;
@@ -9663,7 +9663,7 @@ DLevelScript::DLevelScript (AActor *who, line_t *where, int num, const ScriptPtr
 		PutLast();
 	}
 
-	DPrintf("%s started.\n", ScriptPresentation(num).GetChars());
+	DPrintf(DMSG_SPAMMY, "%s started.\n", ScriptPresentation(num).GetChars());
 }
 
 static void SetScriptState (int script, DLevelScript::EScriptState state)
@@ -9710,12 +9710,12 @@ void P_DoDeferedScripts ()
 
 		case acsdefered_t::defsuspend:
 			SetScriptState (def->script, DLevelScript::SCRIPT_Suspended);
-			DPrintf ("Deferred suspend of %s\n", ScriptPresentation(def->script).GetChars());
+			DPrintf (DMSG_SPAMMY, "Deferred suspend of %s\n", ScriptPresentation(def->script).GetChars());
 			break;
 
 		case acsdefered_t::defterminate:
 			SetScriptState (def->script, DLevelScript::SCRIPT_PleaseRemove);
-			DPrintf ("Deferred terminate of %s\n", ScriptPresentation(def->script).GetChars());
+			DPrintf (DMSG_SPAMMY, "Deferred terminate of %s\n", ScriptPresentation(def->script).GetChars());
 			break;
 		}
 		delete def;
@@ -9751,7 +9751,7 @@ static void addDefered (level_info_t *i, acsdefered_t::EType type, int script, c
 			def->playernum = -1;
 		}
 		i->defered = def;
-		DPrintf ("%s on map %s deferred\n", ScriptPresentation(script).GetChars(), i->MapName.GetChars());
+		DPrintf (DMSG_SPAMMY, "%s on map %s deferred\n", ScriptPresentation(script).GetChars(), i->MapName.GetChars());
 	}
 }
 
diff --git a/src/p_conversation.cpp b/src/p_conversation.cpp
index 64fe2cbab2..5456033688 100644
--- a/src/p_conversation.cpp
+++ b/src/p_conversation.cpp
@@ -253,7 +253,7 @@ static bool LoadScriptFile(int lumpnum, FileReader *lump, int numnodes, bool inc
 
 	if ((type == 1 && !isbinary) || (type == 2 && isbinary))
 	{
-		DPrintf("Incorrect data format for %s.", Wads.GetLumpFullName(lumpnum));
+		DPrintf(DMSG_ERROR, "Incorrect data format for %s.", Wads.GetLumpFullName(lumpnum));
 		return false;
 	}
 
@@ -273,7 +273,7 @@ static bool LoadScriptFile(int lumpnum, FileReader *lump, int numnodes, bool inc
 			// is exactly 1516 bytes long.
 			if (numnodes % 1516 != 0)
 			{
-				DPrintf("Incorrect data format for %s.", Wads.GetLumpFullName(lumpnum));
+				DPrintf(DMSG_ERROR, "Incorrect data format for %s.", Wads.GetLumpFullName(lumpnum));
 				return false;
 			}
 			numnodes /= 1516;
@@ -283,7 +283,7 @@ static bool LoadScriptFile(int lumpnum, FileReader *lump, int numnodes, bool inc
 			// And the teaser version has 1488-byte entries.
 			if (numnodes % 1488 != 0)
 			{
-				DPrintf("Incorrect data format for %s.", Wads.GetLumpFullName(lumpnum));
+				DPrintf(DMSG_ERROR, "Incorrect data format for %s.", Wads.GetLumpFullName(lumpnum));
 				return false;
 			}
 			numnodes /= 1488;
diff --git a/src/p_glnodes.cpp b/src/p_glnodes.cpp
index 0fe4cd9c0b..39c8f8e0dc 100644
--- a/src/p_glnodes.cpp
+++ b/src/p_glnodes.cpp
@@ -1013,7 +1013,7 @@ bool P_CheckNodes(MapData * map, bool rebuilt, int buildtime)
 				subsectors, numsubsectors,
 				vertexes, numvertexes);
 			endTime = I_FPSTime ();
-			DPrintf ("BSP generation took %.3f sec (%d segs)\n", (endTime - startTime) * 0.001, numsegs);
+			DPrintf (DMSG_NOTIFY, "BSP generation took %.3f sec (%d segs)\n", (endTime - startTime) * 0.001, numsegs);
 			buildtime = endTime - startTime;
 		}
 	}
@@ -1026,12 +1026,12 @@ bool P_CheckNodes(MapData * map, bool rebuilt, int buildtime)
 #endif
 		if (level.maptype != MAPTYPE_BUILD && gl_cachenodes && buildtime/1000.f >= gl_cachetime)
 		{
-			DPrintf("Caching nodes\n");
+			DPrintf(DMSG_NOTIFY, "Caching nodes\n");
 			CreateCachedNodes(map);
 		}
 		else
 		{
-			DPrintf("Not caching nodes (time = %f)\n", buildtime/1000.f);
+			DPrintf(DMSG_NOTIFY, "Not caching nodes (time = %f)\n", buildtime/1000.f);
 		}
 	}
 
diff --git a/src/p_maputl.cpp b/src/p_maputl.cpp
index 5fa8aa2f29..a3d4d0e9eb 100644
--- a/src/p_maputl.cpp
+++ b/src/p_maputl.cpp
@@ -361,7 +361,7 @@ bool AActor::FixMapthingPos()
 
 			if (distance < radius)
 			{
-				DPrintf("%s at (%f,%f) lies on %s line %td, distance = %f\n",
+				DPrintf(DMSG_NOTIFY, "%s at (%f,%f) lies on %s line %td, distance = %f\n",
 					this->GetClass()->TypeName.GetChars(), X(), Y(),
 					ldef->Delta().X == 0 ? "vertical" : ldef->Delta().Y == 0 ? "horizontal" : "diagonal",
 					ldef - lines, distance);
diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index 92636fb0cd..d8d95d2776 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -1689,7 +1689,7 @@ static void SetMapThingUserData(AActor *actor, unsigned udi)
 
 		if (var == NULL || (var->Flags & VARF_Native) || !var->Type->IsKindOf(RUNTIME_CLASS(PBasicType)))
 		{
-			DPrintf("%s is not a user variable in class %s\n", varname.GetChars(),
+			DPrintf(DMSG_WARNING, "%s is not a user variable in class %s\n", varname.GetChars(),
 				actor->GetClass()->TypeName.GetChars());
 		}
 		else
@@ -2477,7 +2477,7 @@ int P_DetermineTranslucency (int lumpnum)
 	if (newcolor2.r == 255)	// if black on white results in white it's either
 							// fully transparent or additive
 	{
-		if (developer)
+		if (developer >= DMSG_NOTIFY)
 		{
 			char lumpname[9];
 			lumpname[8] = 0;
@@ -2488,7 +2488,7 @@ int P_DetermineTranslucency (int lumpnum)
 		return -newcolor.r;
 	}
 
-	if (developer)
+	if (developer >= DMSG_NOTIFY)
 	{
 		char lumpname[9];
 		lumpname[8] = 0;
@@ -3028,7 +3028,7 @@ void P_LoadBlockMap (MapData * map)
 		Args->CheckParm("-blockmap")
 		)
 	{
-		DPrintf ("Generating BLOCKMAP\n");
+		DPrintf (DMSG_SPAMMY, "Generating BLOCKMAP\n");
 		P_CreateBlockMap ();
 	}
 	else
@@ -3060,7 +3060,7 @@ void P_LoadBlockMap (MapData * map)
 
 		if (!P_VerifyBlockMap(count))
 		{
-			DPrintf ("Generating BLOCKMAP\n");
+			DPrintf (DMSG_SPAMMY, "Generating BLOCKMAP\n");
 			P_CreateBlockMap();
 		}
 
@@ -3957,7 +3957,7 @@ void P_SetupLevel (const char *lumpname, int position)
 			subsectors, numsubsectors,
 			vertexes, numvertexes);
 		endTime = I_FPSTime ();
-		DPrintf ("BSP generation took %.3f sec (%d segs)\n", (endTime - startTime) * 0.001, numsegs);
+		DPrintf (DMSG_NOTIFY, "BSP generation took %.3f sec (%d segs)\n", (endTime - startTime) * 0.001, numsegs);
 		oldvertextable = builder.GetOldVertexTable();
 		reloop = true;
 	}
diff --git a/src/p_spec.cpp b/src/p_spec.cpp
index 67bb4de73c..4c3bdb488e 100644
--- a/src/p_spec.cpp
+++ b/src/p_spec.cpp
@@ -186,7 +186,7 @@ bool P_ActivateLine (line_t *line, AActor *mo, int side, int activationType, DVe
 		line->special = 0;
 	}
 // end of changed code
-	if (developer && buttonSuccess)
+	if (developer >= DMSG_SPAMMY && buttonSuccess)
 	{
 		Printf ("Line special %d activated on line %i\n", special, int(line - lines));
 	}
@@ -358,7 +358,7 @@ bool P_PredictLine(line_t *line, AActor *mo, int side, int activationType)
 	special = line->special;
 
 	// end of changed code
-	if (developer && buttonSuccess)
+	if (developer >= DMSG_SPAMMY && buttonSuccess)
 	{
 		Printf("Line special %d predicted on line %i\n", special, int(line - lines));
 	}
diff --git a/src/p_tick.cpp b/src/p_tick.cpp
index 978c2c7ef6..332b7af81c 100644
--- a/src/p_tick.cpp
+++ b/src/p_tick.cpp
@@ -42,7 +42,7 @@ extern gamestate_t wipegamestate;
 //
 // P_CheckTickerPaused
 //
-// Returns true if the ticker should be paused. In that cause, it also
+// Returns true if the ticker should be paused. In that case, it also
 // pauses sound effects and possibly music. If the ticker should not be
 // paused, then it returns false but does not unpause anything.
 //
diff --git a/src/p_udmf.cpp b/src/p_udmf.cpp
index 86116f8811..0b054247eb 100644
--- a/src/p_udmf.cpp
+++ b/src/p_udmf.cpp
@@ -147,7 +147,7 @@ extern TArray<int>		linemap;
 
 void UDMFParserBase::Skip()
 {
-	if (developer) sc.ScriptMessage("Ignoring unknown key \"%s\".", sc.String);
+	if (developer >= DMSG_WARNING) sc.ScriptMessage("Ignoring unknown UDMF key \"%s\".", sc.String);
 	if(sc.CheckToken('{'))
 	{
 		int level = 1;
diff --git a/src/p_user.cpp b/src/p_user.cpp
index e4b6ec6bd9..b602432b33 100644
--- a/src/p_user.cpp
+++ b/src/p_user.cpp
@@ -2441,7 +2441,7 @@ void P_PlayerThink (player_t *player)
 					S_ChangeMusic("*");
 				}
 			}
-			DPrintf("MUSINFO change for player %d to %d\n", (int)(player - players), player->MUSINFOactor->args[0]);
+			DPrintf(DMSG_NOTIFY, "MUSINFO change for player %d to %d\n", (int)(player - players), player->MUSINFOactor->args[0]);
 		}
 	}
 
@@ -2828,9 +2828,9 @@ void P_PredictPlayer (player_t *player)
 			DoLerp = (int)PredictionLast.pos.X != (int)player->mo->X() || (int)PredictionLast.pos.Y != (int)player->mo->Y();
 
 			// Aditional Debug information
-			if (developer && DoLerp)
+			if (developer >= DMSG_NOTIFY && DoLerp)
 			{
-				DPrintf("Lerp! Ltic (%d) && Ptic (%d) | Lx (%f) && Px (%f) | Ly (%f) && Py (%f)\n",
+				DPrintf(DMSG_NOTIFY, "Lerp! Ltic (%d) && Ptic (%d) | Lx (%f) && Px (%f) | Ly (%f) && Py (%f)\n",
 					PredictionLast.gametic, i,
 					(PredictionLast.pos.X), (player->mo->X()),
 					(PredictionLast.pos.Y), (player->mo->Y()));
diff --git a/src/posix/sdl/hardware.cpp b/src/posix/sdl/hardware.cpp
index 6142eb1d8e..8bae3f900c 100644
--- a/src/posix/sdl/hardware.cpp
+++ b/src/posix/sdl/hardware.cpp
@@ -242,18 +242,18 @@ void I_SetFPSLimit(int limit)
 	}
 	if (limit == 0)
 	{ // no limit
-		DPrintf("FPS timer disabled\n");
+		DPrintf(DMSG_NOTIFY, "FPS timer disabled\n");
 	}
 	else
 	{
 		FPSLimitTimerEnabled = true;
 		if(timer_create(CLOCK_REALTIME, &FPSLimitEvent, &FPSLimitTimer) == -1)
-			Printf("Failed to create FPS limitter event\n");
+			Printf(DMSG_WARNING, "Failed to create FPS limitter event\n");
 		itimerspec period = { {0, 0}, {0, 0} };
 		period.it_value.tv_nsec = period.it_interval.tv_nsec = 1000000000 / limit;
 		if(timer_settime(FPSLimitTimer, 0, &period, NULL) == -1)
-			Printf("Failed to set FPS limitter timer\n");
-		DPrintf("FPS timer set to %u ms\n", (unsigned int) period.it_interval.tv_nsec / 1000000);
+			Printf(DMSG_WARNING, "Failed to set FPS limitter timer\n");
+		DPrintf(DMSG_NOTIFY, "FPS timer set to %u ms\n", (unsigned int) period.it_interval.tv_nsec / 1000000);
 	}
 }
 #else
diff --git a/src/r_segs.cpp b/src/r_segs.cpp
index 4eb3cb440c..edb1949b62 100644
--- a/src/r_segs.cpp
+++ b/src/r_segs.cpp
@@ -2341,7 +2341,7 @@ void R_CheckDrawSegs ()
 		firstdrawseg = drawsegs + firstofs;
 		ds_p = drawsegs + MaxDrawSegs;
 		MaxDrawSegs = newdrawsegs;
-		DPrintf ("MaxDrawSegs increased to %zu\n", MaxDrawSegs);
+		DPrintf (DMSG_NOTIFY, "MaxDrawSegs increased to %zu\n", MaxDrawSegs);
 	}
 }
 
@@ -2360,7 +2360,7 @@ ptrdiff_t R_NewOpening (ptrdiff_t len)
 			maxopenings = maxopenings ? maxopenings*2 : 16384;
 		while ((size_t)lastopening > maxopenings);
 		openings = (short *)M_Realloc (openings, maxopenings * sizeof(*openings));
-		DPrintf ("MaxOpenings increased to %zu\n", maxopenings);
+		DPrintf (DMSG_NOTIFY, "MaxOpenings increased to %zu\n", maxopenings);
 	}
 	return res;
 }
diff --git a/src/r_things.cpp b/src/r_things.cpp
index aad8fb501e..28b52129b2 100644
--- a/src/r_things.cpp
+++ b/src/r_things.cpp
@@ -222,7 +222,7 @@ vissprite_t *R_NewVisSprite (void)
 		lastvissprite = &vissprites[MaxVisSprites];
 		firstvissprite = &vissprites[firstvisspritenum];
 		vissprite_p = &vissprites[prevvisspritenum];
-		DPrintf ("MaxVisSprites increased to %d\n", MaxVisSprites);
+		DPrintf (DMSG_NOTIFY, "MaxVisSprites increased to %d\n", MaxVisSprites);
 
 		// Allocate sprites from the new pile
 		for (vissprite_t **p = vissprite_p; p < lastvissprite; ++p)
@@ -832,13 +832,11 @@ void R_ProjectSprite (AActor *thing, int fakeside, F3DFloor *fakefloor, F3DFloor
 	else
 	{
 		// decide which texture to use for the sprite
-#ifdef RANGECHECK
-		if (spritenum >= (signed)sprites.Size () || spritenum < 0)
+		if ((unsigned)spritenum >= sprites.Size ())
 		{
-			DPrintf ("R_ProjectSprite: invalid sprite number %u\n", spritenum);
+			DPrintf (DMSG_ERROR, "R_ProjectSprite: invalid sprite number %u\n", spritenum);
 			return;
 		}
-#endif
 		spritedef_t *sprdef = &sprites[spritenum];
 		if (thing->frame >= sprdef->numframes)
 		{
@@ -1312,13 +1310,13 @@ void R_DrawPSprite(DPSprite *pspr, AActor *owner, float bobx, float boby, double
 	// decide which patch to use
 	if ((unsigned)pspr->GetSprite() >= (unsigned)sprites.Size())
 	{
-		DPrintf("R_DrawPSprite: invalid sprite number %i\n", pspr->GetSprite());
+		DPrintf(DMSG_ERROR, "R_DrawPSprite: invalid sprite number %i\n", pspr->GetSprite());
 		return;
 	}
 	sprdef = &sprites[pspr->GetSprite()];
 	if (pspr->GetFrame() >= sprdef->numframes)
 	{
-		DPrintf("R_DrawPSprite: invalid sprite frame %i : %i\n", pspr->GetSprite(), pspr->GetFrame());
+		DPrintf(DMSG_ERROR, "R_DrawPSprite: invalid sprite frame %i : %i\n", pspr->GetSprite(), pspr->GetFrame());
 		return;
 	}
 	sprframe = &SpriteFrames[sprdef->spriteframes + pspr->GetFrame()];
diff --git a/src/resourcefiles/file_wad.cpp b/src/resourcefiles/file_wad.cpp
index 0732d4c115..5965a5c8a6 100644
--- a/src/resourcefiles/file_wad.cpp
+++ b/src/resourcefiles/file_wad.cpp
@@ -471,7 +471,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 				{
 					// We can't add this to the flats namespace but 
 					// it needs to be flagged for the texture manager.
-					DPrintf("Marking %s as potential flat\n", Lumps[i].Name);
+					DPrintf(DMSG_NOTIFY, "Marking %s as potential flat\n", Lumps[i].Name);
 					Lumps[i].Flags |= LUMPF_MAYBEFLAT;
 				}
 			}
@@ -517,7 +517,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 		}
 
 		// we found a marked block
-		DPrintf("Found %s block at (%d-%d)\n", startmarker, markers[start].index, end);
+		DPrintf(DMSG_NOTIFY, "Found %s block at (%d-%d)\n", startmarker, markers[start].index, end);
 		for(int j = markers[start].index + 1; j < end; j++)
 		{
 			if (Lumps[j].Namespace != ns_global)
@@ -534,7 +534,7 @@ void FWadFile::SetNamespace(const char *startmarker, const char *endmarker, name
 				// ignore sprite lumps smaller than 8 bytes (the smallest possible)
 				// in size -- this was used by some dmadds wads
 				// as an 'empty' graphics resource
-				DPrintf(" Skipped empty sprite %s (lump %d)\n", Lumps[j].Name, j);
+				DPrintf(DMSG_WARNING, " Skipped empty sprite %s (lump %d)\n", Lumps[j].Name, j);
 			}
 			else
 			{
diff --git a/src/s_playlist.cpp b/src/s_playlist.cpp
index ec775e275f..e1b0fd5b61 100644
--- a/src/s_playlist.cpp
+++ b/src/s_playlist.cpp
@@ -182,7 +182,7 @@ int FPlayList::SetPosition (int position)
 	{
 		Position = position;
 	}
-	DPrintf ("Playlist position set to %d\n", Position);
+	DPrintf (DMSG_NOTIFY, "Playlist position set to %d\n", Position);
 	return Position;
 }
 
@@ -197,7 +197,7 @@ int FPlayList::Advance ()
 	{
 		Position = 0;
 	}
-	DPrintf ("Playlist advanced to song %d\n", Position);
+	DPrintf (DMSG_NOTIFY, "Playlist advanced to song %d\n", Position);
 	return Position;
 }
 
@@ -207,7 +207,7 @@ int FPlayList::Backup ()
 	{
 		Position = Songs.Size() - 1;
 	}
-	DPrintf ("Playlist backed up to song %d\n", Position);
+	DPrintf (DMSG_NOTIFY, "Playlist backed up to song %d\n", Position);
 	return Position;
 }
 
diff --git a/src/s_sound.cpp b/src/s_sound.cpp
index 321cbce1b8..2149f7814d 100644
--- a/src/s_sound.cpp
+++ b/src/s_sound.cpp
@@ -552,7 +552,7 @@ void S_UnloadSound (sfxinfo_t *sfx)
 		GSnd->UnloadSound(sfx->data);
 		sfx->data.Clear();
         sfx->data3d.Clear();
-		DPrintf("Unloaded sound \"%s\" (%td)\n", sfx->name.GetChars(), sfx - &S_sfx[0]);
+		DPrintf(DMSG_NOTIFY, "Unloaded sound \"%s\" (%td)\n", sfx->name.GetChars(), sfx - &S_sfx[0]);
 	}
 }
 
@@ -1327,7 +1327,7 @@ sfxinfo_t *S_LoadSound(sfxinfo_t *sfx)
 		{
 			if (S_sfx[i].data.isValid() && S_sfx[i].link == sfxinfo_t::NO_LINK && S_sfx[i].lumpnum == sfx->lumpnum)
 			{
-				DPrintf ("Linked %s to %s (%d)\n", sfx->name.GetChars(), S_sfx[i].name.GetChars(), i);
+				DPrintf (DMSG_NOTIFY, "Linked %s to %s (%d)\n", sfx->name.GetChars(), S_sfx[i].name.GetChars(), i);
 				sfx->link = i;
 				// This is necessary to avoid using the rolloff settings of the linked sound if its
 				// settings are different.
@@ -1336,7 +1336,7 @@ sfxinfo_t *S_LoadSound(sfxinfo_t *sfx)
 			}
 		}
 
-		DPrintf("Loading sound \"%s\" (%td)\n", sfx->name.GetChars(), sfx - &S_sfx[0]);
+		DPrintf(DMSG_NOTIFY, "Loading sound \"%s\" (%td)\n", sfx->name.GetChars(), sfx - &S_sfx[0]);
 
 		int size = Wads.LumpLength(sfx->lumpnum);
 		if (size > 0)
@@ -1396,7 +1396,7 @@ static void S_LoadSound3D(sfxinfo_t *sfx)
     if(sfx->data3d.isValid())
         return;
 
-    DPrintf("Loading monoized sound \"%s\" (%td)\n", sfx->name.GetChars(), sfx - &S_sfx[0]);
+    DPrintf(DMSG_NOTIFY, "Loading monoized sound \"%s\" (%td)\n", sfx->name.GetChars(), sfx - &S_sfx[0]);
 
     int size = Wads.LumpLength(sfx->lumpnum);
     if(size <= 0) return;
diff --git a/src/sc_man.cpp b/src/sc_man.cpp
index da106927e3..3f5530ff36 100644
--- a/src/sc_man.cpp
+++ b/src/sc_man.cpp
@@ -1044,7 +1044,7 @@ void FScriptPosition::Message (int severity, const char *message, ...) const
 {
 	FString composed;
 
-	if ((severity == MSG_DEBUG || severity == MSG_DEBUGLOG) && !developer) return;
+	if ((severity == MSG_DEBUG || severity == MSG_DEBUGLOG) && developer < DMSG_NOTIFY) return;
 	if (severity == MSG_OPTERROR)
 	{
 		severity = strictdecorate ? MSG_ERROR : MSG_WARNING;
diff --git a/src/sound/fmodsound.cpp b/src/sound/fmodsound.cpp
index 465aade9b6..2db5a98a10 100644
--- a/src/sound/fmodsound.cpp
+++ b/src/sound/fmodsound.cpp
@@ -1994,7 +1994,7 @@ FISoundChannel *FMODSoundRenderer::StartSound(SoundHandle sfx, float vol, int pi
 		return CommonChannelSetup(chan, reuse_chan);
 	}
 
-	//DPrintf ("Sound %s failed to play: %d\n", sfx->name.GetChars(), result);
+	//DPrintf (DMSG_WARNING, "Sound %s failed to play: %d\n", sfx->name.GetChars(), result);
 	return NULL;
 }
 
@@ -2142,7 +2142,7 @@ FISoundChannel *FMODSoundRenderer::StartSound3D(SoundHandle sfx, SoundListener *
 	}
 
 	GRolloff = NULL;
-	//DPrintf ("Sound %s failed to play: %d\n", sfx->name.GetChars(), result);
+	//DPrintf (DMSG_WARNING, "Sound %s failed to play: %d\n", sfx->name.GetChars(), result);
 	return 0;
 }
 
@@ -2566,7 +2566,7 @@ void FMODSoundRenderer::UpdateListener(SoundListener *listener)
 	}
 	if (env != PrevEnvironment || env->Modified)
 	{
-		DPrintf ("Reverb Environment %s\n", env->Name);
+		DPrintf (DMSG_NOTIFY, "Reverb Environment %s\n", env->Name);
 		const_cast<ReverbContainer*>(env)->Modified = false;
 		SetSystemReverbProperties(&env->Properties);
 		PrevEnvironment = env;
@@ -2791,7 +2791,7 @@ std::pair<SoundHandle,bool> FMODSoundRenderer::LoadSoundRaw(BYTE *sfxdata, int l
 	result = Sys->createSound((char *)sfxdata, samplemode, &exinfo, &sample);
 	if (result != FMOD_OK)
 	{
-		DPrintf("Failed to allocate sample: Error %d\n", result);
+		DPrintf(DMSG_ERROR, "Failed to allocate sample: Error %d\n", result);
 		return std::make_pair(retval, true);
 	}
 
@@ -2829,7 +2829,7 @@ std::pair<SoundHandle,bool> FMODSoundRenderer::LoadSound(BYTE *sfxdata, int leng
 	result = Sys->createSound((char *)sfxdata, samplemode, &exinfo, &sample);
 	if (result != FMOD_OK)
 	{
-		DPrintf("Failed to allocate sample: Error %d\n", result);
+		DPrintf(DMSG_ERROR, "Failed to allocate sample: Error %d\n", result);
 		return std::make_pair(retval, true);
 	}
 	SetCustomLoopPts(sample);
diff --git a/src/sound/i_sound.cpp b/src/sound/i_sound.cpp
index f19e080c34..67f46b266f 100644
--- a/src/sound/i_sound.cpp
+++ b/src/sound/i_sound.cpp
@@ -417,7 +417,7 @@ short *SoundRenderer::DecodeSample(int outlen, const void *coded, int sizebytes,
     decoder->getInfo(&srate, &chans, &type);
     if(chans != ChannelConfig_Mono || type != SampleType_Int16)
     {
-        DPrintf("Sample is not 16-bit mono\n");
+        DPrintf(DMSG_WARNING, "Sample is not 16-bit mono\n");
         delete decoder;
         return samples;
     }
@@ -553,7 +553,7 @@ std::pair<SoundHandle,bool> SoundRenderer::LoadSoundVoc(BYTE *sfxdata, int lengt
 				break;
 			default: // Unknown block type
 				okay = false;
-				DPrintf ("Unknown VOC block type %i\n", blocktype);
+				DPrintf (DMSG_ERROR, "Unknown VOC block type %i\n", blocktype);
 				break;
 			}
 			// Move to next block
diff --git a/src/sound/music_fluidsynth_mididevice.cpp b/src/sound/music_fluidsynth_mididevice.cpp
index 0427ca438f..b3f7b7d458 100644
--- a/src/sound/music_fluidsynth_mididevice.cpp
+++ b/src/sound/music_fluidsynth_mididevice.cpp
@@ -498,12 +498,12 @@ int FluidSynthMIDIDevice::LoadPatchSets(const char *patches)
 		}
 		if (FLUID_FAILED != fluid_synth_sfload(FluidSynth, path, count == 0))
 		{
-			DPrintf("Loaded patch set %s.\n", tok);
+			DPrintf(DMSG_NOTIFY, "Loaded patch set %s.\n", tok);
 			count++;
 		}
 		else
 		{
-			DPrintf("Failed to load patch set %s.\n", tok);
+			DPrintf(DMSG_ERROR, "Failed to load patch set %s.\n", tok);
 		}
 		tok = strtok(NULL, delim);
 	}
diff --git a/src/sound/music_midi_timidity.cpp b/src/sound/music_midi_timidity.cpp
index 30468839d4..ee9d322a40 100644
--- a/src/sound/music_midi_timidity.cpp
+++ b/src/sound/music_midi_timidity.cpp
@@ -376,7 +376,7 @@ bool TimidityPPMIDIDevice::LaunchTimidity ()
 		return false;
 	}
 
-	DPrintf ("cmd: \x1cG%s\n", CommandLine.GetChars());
+	DPrintf (DMSG_NOTIFY, "cmd: \x1cG%s\n", CommandLine.GetChars());
 
 #ifdef _WIN32
 	STARTUPINFO startup = { sizeof(startup), };
diff --git a/src/sound/music_xmi_midiout.cpp b/src/sound/music_xmi_midiout.cpp
index 50b95a7762..a9cbcd2c60 100644
--- a/src/sound/music_xmi_midiout.cpp
+++ b/src/sound/music_xmi_midiout.cpp
@@ -143,7 +143,7 @@ XMISong::XMISong (FileReader &reader, EMidiDevice type, const char *args)
 	memset(Songs, 0, sizeof(*Songs) * NumSongs);
 	FindXMIDforms(MusHeader, SongLen, Songs);
 	CurrSong = Songs;
-	DPrintf("XMI song count: %d\n", NumSongs);
+	DPrintf(DMSG_SPAMMY, "XMI song count: %d\n", NumSongs);
 }
 
 //==========================================================================
diff --git a/src/sound/oalsound.cpp b/src/sound/oalsound.cpp
index 6dd204c866..21370d082e 100644
--- a/src/sound/oalsound.cpp
+++ b/src/sound/oalsound.cpp
@@ -747,8 +747,8 @@ OpenALSoundRenderer::OpenALSoundRenderer()
     ALCint major=0, minor=0;
     alcGetIntegerv(Device, ALC_MAJOR_VERSION, 1, &major);
     alcGetIntegerv(Device, ALC_MINOR_VERSION, 1, &minor);
-    DPrintf("  ALC Version: " TEXTCOLOR_BLUE"%d.%d\n", major, minor);
-    DPrintf("  ALC Extensions: " TEXTCOLOR_ORANGE"%s\n", alcGetString(Device, ALC_EXTENSIONS));
+    DPrintf(DMSG_SPAMMY, "  ALC Version: " TEXTCOLOR_BLUE"%d.%d\n", major, minor);
+    DPrintf(DMSG_SPAMMY, "  ALC Extensions: " TEXTCOLOR_ORANGE"%s\n", alcGetString(Device, ALC_EXTENSIONS));
 
     TArray<ALCint> attribs;
     if(*snd_samplerate > 0)
@@ -778,10 +778,10 @@ OpenALSoundRenderer::OpenALSoundRenderer()
     }
     attribs.Clear();
 
-    DPrintf("  Vendor: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_VENDOR));
-    DPrintf("  Renderer: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_RENDERER));
-    DPrintf("  Version: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_VERSION));
-    DPrintf("  Extensions: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_EXTENSIONS));
+    DPrintf(DMSG_SPAMMY, "  Vendor: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_VENDOR));
+    DPrintf(DMSG_SPAMMY, "  Renderer: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_RENDERER));
+    DPrintf(DMSG_SPAMMY, "  Version: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_VERSION));
+    DPrintf(DMSG_SPAMMY, "  Extensions: " TEXTCOLOR_ORANGE"%s\n", alGetString(AL_EXTENSIONS));
 
     ALC.EXT_EFX = !!alcIsExtensionPresent(Device, "ALC_EXT_EFX");
     ALC.EXT_disconnect = !!alcIsExtensionPresent(Device, "ALC_EXT_disconnect");
@@ -864,7 +864,7 @@ OpenALSoundRenderer::OpenALSoundRenderer()
         return;
     }
     FreeSfx = Sources;
-    DPrintf("  Allocated " TEXTCOLOR_BLUE"%u" TEXTCOLOR_NORMAL" sources\n", Sources.Size());
+    DPrintf(DMSG_NOTIFY, "  Allocated " TEXTCOLOR_BLUE"%u" TEXTCOLOR_NORMAL" sources\n", Sources.Size());
 
     WasInWater = false;
     if(*snd_efx && ALC.EXT_EFX)
@@ -913,10 +913,10 @@ OpenALSoundRenderer::OpenALSoundRenderer()
             {
                 alEffecti(envReverb, AL_EFFECT_TYPE, AL_EFFECT_EAXREVERB);
                 if(alGetError() == AL_NO_ERROR)
-                    DPrintf("  EAX Reverb found\n");
+                    DPrintf(DMSG_SPAMMY, "  EAX Reverb found\n");
                 alEffecti(envReverb, AL_EFFECT_TYPE, AL_EFFECT_REVERB);
                 if(alGetError() == AL_NO_ERROR)
-                    DPrintf("  Standard Reverb found\n");
+                    DPrintf(DMSG_SPAMMY, "  Standard Reverb found\n");
 
                 alDeleteEffects(1, &envReverb);
                 getALError();
@@ -929,7 +929,7 @@ OpenALSoundRenderer::OpenALSoundRenderer()
                 alFilteri(EnvFilters[0], AL_FILTER_TYPE, AL_FILTER_LOWPASS);
                 alFilteri(EnvFilters[1], AL_FILTER_TYPE, AL_FILTER_LOWPASS);
                 if(getALError() == AL_NO_ERROR)
-                    DPrintf("  Lowpass found\n");
+                    DPrintf(DMSG_SPAMMY, "  Lowpass found\n");
                 else
                 {
                     alDeleteFilters(2, EnvFilters);
@@ -1194,7 +1194,7 @@ std::pair<SoundHandle,bool> OpenALSoundRenderer::LoadSoundRaw(BYTE *sfxdata, int
             loopend = length / (channels*bits/8);
 
         ALint loops[2] = { loopstart, loopend };
-        DPrintf("Setting loop points %d -> %d\n", loops[0], loops[1]);
+        DPrintf(DMSG_NOTIFY, "Setting loop points %d -> %d\n", loops[0], loops[1]);
         alBufferiv(buffer, AL_LOOP_POINTS_SOFT, loops);
         getALError();
     }
@@ -1202,7 +1202,7 @@ std::pair<SoundHandle,bool> OpenALSoundRenderer::LoadSoundRaw(BYTE *sfxdata, int
     {
         static bool warned = false;
         if(!warned)
-            Printf("Loop points not supported!\n");
+            Printf(DMSG_WARNING, "Loop points not supported!\n");
         warned = true;
     }
 
@@ -1867,7 +1867,7 @@ void OpenALSoundRenderer::UpdateListener(SoundListener *listener)
     if(env != PrevEnvironment || env->Modified)
     {
         PrevEnvironment = env;
-        DPrintf("Reverb Environment %s\n", env->Name);
+        DPrintf(DMSG_NOTIFY, "Reverb Environment %s\n", env->Name);
 
         if(EnvSlot != 0)
             LoadReverb(env);
diff --git a/src/v_video.cpp b/src/v_video.cpp
index 01a73950b2..0ee065bbe9 100644
--- a/src/v_video.cpp
+++ b/src/v_video.cpp
@@ -907,11 +907,12 @@ void DFrameBuffer::DrawRateStuff ()
 		// Drawing it as a texture does and continues to show how
 		// well the PalTex shader is working.
 		static FPaletteTester palette;
+		int size = screen->GetHeight() < 800 ? 16 * 7 : 16 * 7 * 2;
 
 		palette.SetTranslation(vid_showpalette);
 		DrawTexture(&palette, 0, 0,
-			DTA_DestWidth, 16*7,
-			DTA_DestHeight, 16*7,
+			DTA_DestWidth, size,
+			DTA_DestHeight, size,
 			DTA_Masked, false,
 			TAG_DONE);
 	}
diff --git a/src/win32/win32video.cpp b/src/win32/win32video.cpp
index 29bb905fbe..8eb2349ec2 100644
--- a/src/win32/win32video.cpp
+++ b/src/win32/win32video.cpp
@@ -793,7 +793,7 @@ void I_SetFPSLimit(int limit)
 			CloseHandle(FPSLimitEvent);
 			FPSLimitEvent = NULL;
 		}
-		DPrintf("FPS timer disabled\n");
+		DPrintf(DMSG_NOTIFY, "FPS timer disabled\n");
 	}
 	else
 	{
@@ -802,7 +802,7 @@ void I_SetFPSLimit(int limit)
 			FPSLimitEvent = CreateEvent(NULL, FALSE, TRUE, NULL);
 			if (FPSLimitEvent == NULL)
 			{ // Could not create event, so cannot use timer.
-				Printf("Failed to create FPS limitter event\n");
+				Printf(DMSG_WARNING, "Failed to create FPS limitter event\n");
 				return;
 			}
 		}
@@ -817,7 +817,7 @@ void I_SetFPSLimit(int limit)
 			Printf("Failed to create FPS limitter timer\n");
 			return;
 		}
-		DPrintf("FPS timer set to %u ms\n", period);
+		DPrintf(DMSG_NOTIFY, "FPS timer set to %u ms\n", period);
 	}
 }
 
diff --git a/wadsrc/static/language.enu b/wadsrc/static/language.enu
index d80c048b7e..ed224cb575 100644
--- a/wadsrc/static/language.enu
+++ b/wadsrc/static/language.enu
@@ -1957,6 +1957,7 @@ MSGMNU_TEAMMESSAGES			= "Team Messages";
 MSGMNU_CENTEREDMESSAGES		= "Centered Messages";
 MSGMNU_SCREENSHOTMESSAGES	= "Screenshot messages";
 MSGMNU_LONGSAVEMESSAGES		= "Detailed save messages";
+MSGMNU_DEVELOPER			= "Developer message mode";
 
 // Scoreboard Options
 SCRBRDMNU_TITLE				= "SCOREBOARD OPTIONS";
@@ -2287,6 +2288,10 @@ OPTVAL_SINC					= "Sinc";
 OPTVAL_NOTEONOFFONLY		= "Note on/off only";
 OPTVAL_FULLRAMPING			= "Full ramping";
 OPTVAL_ALLUNACKNOWLEDGED	= "All unacknowledged";
+OPTVAL_ERRORS				= "Errors";
+OPTVAL_WARNINGS				= "Warnings";
+OPTVAL_NOTIFICATIONS		= "Notifications";
+OPTVAL_EVERYTHING			= "Everything";
 // Colors
 C_BRICK					= "\cabrick";
 C_TAN					= "\cbtan";
diff --git a/wadsrc/static/menudef.txt b/wadsrc/static/menudef.txt
index 077dc06087..203576e5d4 100644
--- a/wadsrc/static/menudef.txt
+++ b/wadsrc/static/menudef.txt
@@ -1118,6 +1118,15 @@ OptionValue MessageLevels
 	2.0, "$OPTVAL_CRITICALMESSAGES"
 }
 
+OptionValue DevMessageLevels
+{
+	0, "$OPTVAL_OFF"
+	1, "$OPTVAL_ERRORS"
+	2, "$OPTVAL_WARNINGS",
+	3, "$OPTVAL_NOTIFICATIONS"
+	4, "$OPTVAL_EVERYTHING"
+}
+
 OptionMenu MessageOptions
 {
 	Title 	"$MSGMNU_TITLE"
@@ -1126,6 +1135,7 @@ OptionMenu MessageOptions
 	Option "$MSGMNU_SHOWSECRETS",				"cl_showsecretmessage", "OnOff"
 	Option "$MSGMNU_SCALETEXT", 				"con_scaletext", "ScaleValues"
 	Option "$MSGMNU_MESSAGELEVEL", 				"msg", "MessageLevels"
+	Option "$MSGMNU_DEVELOPER", 				"developer", "DevMessageLevels"
 	Option "$MSGMNU_CENTERMESSAGES",			"con_centernotify", "OnOff"
 	StaticText " "
 	StaticText "$MSGMNU_MESSAGECOLORS", 1