diff --git a/src/d_iwad.cpp b/src/d_iwad.cpp
index 6f33c718e..e30cf9e28 100644
--- a/src/d_iwad.cpp
+++ b/src/d_iwad.cpp
@@ -133,6 +133,7 @@ void FIWadManager::ParseIWadInfo(const char *fn, const char *data, int datasize,
 					{
 						sc.MustGetString();
 						if(sc.Compare("NoTextcolor")) iwad->flags |= GI_NOTEXTCOLOR;
+						else if (sc.Compare("NoBigFont")) iwad->flags |= GI_IGNOREBIGFONTLUMP;
 						else if(sc.Compare("Poly1")) iwad->flags |= GI_COMPATPOLY1;
 						else if(sc.Compare("Poly2")) iwad->flags |= GI_COMPATPOLY2;
 						else if(sc.Compare("Shareware")) iwad->flags |= GI_SHAREWARE;
diff --git a/src/gamedata/gi.h b/src/gamedata/gi.h
index c9ffa40f8..b5572da73 100644
--- a/src/gamedata/gi.h
+++ b/src/gamedata/gi.h
@@ -50,6 +50,7 @@ enum
 	GI_COMPATPOLY2			= 0x00000080,	// so does HEXDD's MAP47
 	GI_NOTEXTCOLOR			= 0x00000100,	// Chex Quest 3 would have everything green
 	GI_IGNORETITLEPATCHES	= 0x00000200,	// Ignore the map name graphics when not runnning in English language
+	GI_IGNOREBIGFONTLUMP	= 0x00000400,	// Needed for Chex Quest 3, so that the extended internal font can be used instead.
 };
 
 #include "gametype.h"
diff --git a/src/gamedata/w_wad.cpp b/src/gamedata/w_wad.cpp
index 40af891ca..1d5dfe444 100644
--- a/src/gamedata/w_wad.cpp
+++ b/src/gamedata/w_wad.cpp
@@ -897,6 +897,15 @@ void FWadCollection::RenameSprites ()
 			// Rename the game specific big font lumps so that the font manager does not have to do problematic special checks for them.
 			if (!strcmp(LumpInfo[i].lump->Name, altbigfont)) 
 				strcpy(LumpInfo[i].lump->Name, "BIGFONT");
+
+			if (LumpInfo[i].wadnum == GetIwadNum() && gameinfo.flags & GI_IGNOREBIGFONTLUMP)
+			{
+				if (!strcmp(LumpInfo[i].lump->Name, "BIGFONT"))
+				{
+					LumpInfo[i].lump->Name[0] = 0;
+				}
+			}
+
 		}
 	}
 }
diff --git a/src/rendering/hwrenderer/scene/hw_walls.cpp b/src/rendering/hwrenderer/scene/hw_walls.cpp
index 91ec1a5f8..000360888 100644
--- a/src/rendering/hwrenderer/scene/hw_walls.cpp
+++ b/src/rendering/hwrenderer/scene/hw_walls.cpp
@@ -489,6 +489,7 @@ void GLWall::PutPortal(HWDrawInfo *di, int ptype, int plane)
 {
 	auto pstate = screen->mPortalState;
 	HWPortal * portal = nullptr;
+	return;
 
 	MakeVertices(di, false);
 	switch (ptype)
diff --git a/wadsrc/static/iwadinfo.txt b/wadsrc/static/iwadinfo.txt
index c75fc166d..f4320d707 100644
--- a/wadsrc/static/iwadinfo.txt
+++ b/wadsrc/static/iwadinfo.txt
@@ -104,7 +104,7 @@ IWad
 	Config = "Chex"
 	IWADName = "chex3.wad"
 	Mapinfo = "mapinfo/chex.txt"
-	Compatibility = "NoTextcolor"
+	Compatibility = "NoTextcolor", "IgnoreBigFontLump"
 	MustContain = "E1M1", "CYCLA1", "FLMBA1", "MAPINFO"
 	BannerColors = "ff ff 00", "00 c0 00"
 }