diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 3302a5649..102f19044 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -58,6 +58,7 @@ L_State g_engState;
 #define HIGH_PRECISION_SPRITE
 #define MULTI_COLUMN_VLINE
 //#define DEBUG_TILESIZY_512
+//#define DEBUG_TILEOFFSETS
 
 #if !defined DEBUG_MAIN_ARRAYS
 const int32_t engine_main_arrays_are_static = 0;  // for Lunatic
@@ -11126,6 +11127,24 @@ void loadtile(int16_t tilenume)
             p[i] = i;
     }
 #endif
+#ifdef DEBUG_TILEOFFSETS
+    // Add some dark blue marker lines to STEAM and CEILINGSTEAM.
+    // See test_tileoffsets.map.
+    if (tilenume==1250 || tilenume==1255)
+    {
+        char *p = (char *)waloff[tilenume];
+        p[0] = p[1] = p[2] = p[3] = 254;
+    }
+
+    // Add some offset to the cocktail glass neon sign. It's more asymmetric
+    // than the steam, and thus more suited to debugging the spatial
+    // orientation of drawn sprites.
+    if (tilenume==1008)
+    {
+        picanm[tilenume].xofs = 8;
+        picanm[tilenume].yofs = 12;
+    }
+#endif
 }
 
 //
diff --git a/polymer/eduke32/package/samples/test_tileoffsets.map b/polymer/eduke32/package/samples/test_tileoffsets.map
index 41ed0ed97..99d42370c 100644
Binary files a/polymer/eduke32/package/samples/test_tileoffsets.map and b/polymer/eduke32/package/samples/test_tileoffsets.map differ