diff --git a/polymer/eduke32/build/include/build.h b/polymer/eduke32/build/include/build.h
index 11990baf3..5e34de756 100644
--- a/polymer/eduke32/build/include/build.h
+++ b/polymer/eduke32/build/include/build.h
@@ -529,7 +529,7 @@ static inline void inplace_vx_tweak_sector(sectortypevx *vxsec, int32_t yaxp)
 # undef SECTORVX_SZ1
 # undef SECTORVX_SZ4
 
-// 36 bytes
+// 38 bytes
 typedef struct
 {
     Tracker(Wall, int32_t) x, y;
@@ -541,9 +541,10 @@ typedef struct
     Tracker(Wall, uint8_t) pal, xrepeat, yrepeat, xpanning, ypanning;
     Tracker(Wall, uint16_t) lotag, hitag;
     Tracker(Wall, int16_t) extra;
+    Tracker(Wall, uint8_t) blend, filler_;
 } walltypevx;
 
-# define WALLVX_SZ2 sizeof(walltypevx)-offsetof(walltypevx, cstat)
+# define WALLVX_SZ2 offsetof(walltypevx, blend)-offsetof(walltypevx, cstat)
 
 static inline void copy_v7_from_vx_wall(walltypev7 *v7wal, const walltypevx *vxwal)
 {
@@ -561,6 +562,8 @@ static inline void inplace_vx_from_v7_wall(walltypevx *vxwal)
 
     /* [cstat..extra] */
     Bmemmove(&vxwal->cstat, &v7wal->cstat, WALLVX_SZ2);
+
+    vxwal->blend = vxwal->filler_ = 0;
 }
 
 static inline void inplace_vx_tweak_wall(walltypevx *vxwal, int32_t yaxp)
diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 36c7342e2..e9d7c3c10 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -665,7 +665,7 @@ void yax_update(int32_t resetstat)
 #if !defined NEW_MAP_FORMAT
     editstatus = oeditstatus;
 #else
-    mapversion = (numyaxbunches>0) ? 10 : get_mapversion();
+    mapversion = get_mapversion();
 #endif
 }
 
@@ -6694,8 +6694,11 @@ static void drawmaskwall(int16_t damaskwallcnt)
     else
     {
         if (globalorientation&128)
+#ifdef NEW_MAP_FORMAT
+            setup_blend(wal->blend, globalorientation&512);
+#else
             setup_blend(0, globalorientation&512);
-
+#endif
         transmaskwallscan(xb1[z],xb2[z], 0);
     }
 }
@@ -10986,13 +10989,26 @@ int32_t loadmaphack(const char *filename)
 LUNATIC_CB int32_t (*saveboard_maptext)(const char *filename, const vec3_t *dapos, int16_t daang, int16_t dacursectnum);
 #endif
 
-// Get map version of binary map format (< map-int VX).
+// Get map version of external map format (<10: old binary format, ==10: new
+// 'VX' map-text format).
 static int32_t get_mapversion(void)
 {
 #ifdef YAX_ENABLE
     if (numyaxbunches > 0)
+# ifdef NEW_MAP_FORMAT
+        return 10;
+# else
         return 9;
-    else
+# endif
+#endif
+
+#ifdef NEW_MAP_FORMAT
+    {
+        int32_t i;
+        for (i=0; i<numwalls; i++)
+            if (wall[i].blend != 0)
+                return 10;
+    }
 #endif
     if (numsectors > MAXSECTORSV7 || numwalls > MAXWALLSV7 || Numsprites > MAXSPRITESV7)
         return 8;
@@ -11038,8 +11054,11 @@ int32_t saveboard(const char *filename, const vec3_t *dapos, int16_t daang, int1
     // and the engine-reported number of sprites 'Numsprites'.
     Bassert(numsprites == Numsprites);
 
+    // Determine the map version.
+    mapversion = get_mapversion();
+
 #ifdef NEW_MAP_FORMAT
-    if (numyaxbunches > 0)
+    if (mapversion == 10)
     {
         initprintf("Saving of TROR maps not yet accessible in the Lunatic preview build\n");
         return -1;
@@ -11055,8 +11074,6 @@ int32_t saveboard(const char *filename, const vec3_t *dapos, int16_t daang, int1
         return -1;
     }
 
-    // Determine the map version.
-    mapversion = get_mapversion();
     tl = B_LITTLE32(mapversion);    Bwrite(fil,&tl,4);
 
     tl = B_LITTLE32(dapos->x);      Bwrite(fil,&tl,4);
diff --git a/polymer/eduke32/source/lunatic/defs_common.lua b/polymer/eduke32/source/lunatic/defs_common.lua
index 7f3e95bcc..78890165a 100644
--- a/polymer/eduke32/source/lunatic/defs_common.lua
+++ b/polymer/eduke32/source/lunatic/defs_common.lua
@@ -25,7 +25,7 @@ ffi.cdef "const char **g_argv;"
 --           (env var: LUAJIT_DUMPFILE)
 --  profile: load LuaJIT's 'jit.p' module for profiling (LuaJIT 2.1 only)
 --           (env var: LUAJIT_PROFILEFILE)
---   strict: catch various conditions that may indicate an logical error
+--   strict: catch various conditions that may indicate a logical error
 -- TODO for strict: actor[], spriteext[], per-actor gamevars
 local debug_flags = {}
 local IS_DEBUG_FLAG = {
@@ -242,6 +242,7 @@ struct {
     int8_t shade;
     uint8_t pal, xrepeat, yrepeat, xpanning, ypanning;
     int16_t lotag, hitag, extra;
+    uint8_t blend, _filler;
 }]]
 
 -- NOTE for FFI definitions: we're compiling EDuke32 with -funsigned-char, so
diff --git a/polymer/eduke32/source/lunatic/engine_maptext.lua b/polymer/eduke32/source/lunatic/engine_maptext.lua
index 1307163c6..fa6dce2c2 100644
--- a/polymer/eduke32/source/lunatic/engine_maptext.lua
+++ b/polymer/eduke32/source/lunatic/engine_maptext.lua
@@ -67,13 +67,13 @@ local wall_members = {
 
     -- optional
     f = "cstat",
-    m = "overpicnum",
+    m = "overpicnum", b = "blend",
     p = "pal",
     w = { "upwall", -1 }, W = { "dnwall", -1 },
     o = "lotag", i = "hitag", e = { "extra", -1 }
 }
 
-local wall_ord = { mand="1 23 4 5 6 78 90 ", opt="f m p wW oie" }
+local wall_ord = { mand="1 23 4 5 6 78 90 ", opt="f mb p wW oie" }
 local wall_default = ffi.new("const walltype", { extra = -1, upwall=-1, dnwall=-1 })