diff --git a/TODO.txt b/TODO.txt
index d4870a7..87daf73 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -47,14 +47,15 @@ fuck issue trackers :D
 
 - immediately after starting the map countdown seems to be lower (seems to
   perhaps be caused by nextPhysicsFrameTime, look into it)
-- seems like there might be a bug in physics env function, despite it being
-  impossible in theory, car gets stuck after fast drive into a wall, with its
-  shape staying OK, but wheel being inside a block somehow, maybe there are
-  tiny spaces between blocks or some blocks are not checked -- resolve
 
 =========== HANDLED ==============
 
 - should drifting make a sound? NO NEED
+- seems like there might be a bug in physics env function, despite it being
+  impossible in theory, car gets stuck after fast drive into a wall, with its
+  shape staying OK, but wheel being inside a block somehow, maybe there are
+  tiny spaces between blocks or some blocks are not checked -- resolve
+  [4 4 63] [5 5 64] [5 4 63] [4 5 64] [4 5 63] [5 4 64] [5 5 63] [4 4 64]
 - Managed to get the car stuck in non-rotating state, then after a while get
   it back by crashing. MAY BE FIXED NOW, watch if it still happens
 - After adding the non-rotating physics feature, the car now gets funny when
diff --git a/game.h b/game.h
index 4e4b71b..572ae2c 100644
--- a/game.h
+++ b/game.h
@@ -1257,47 +1257,38 @@ void LCR_gameDraw3DView(void)
   // GUI/HUD:
 
   char str[10];
+  int val = LCR_carSpeedKMH();
 
-  switch (LCR_game.state)
-  {
-    default:
-    {
-      int val = LCR_carSpeedKMH();
+  if (val < 5) // don't show tiny oscillations when still
+    val = 0;
 
-      if (val < 5) // don't show tiny oscillations when still
-        val = 0;
+  str[0] = val >= 100 ? '0' + (val / 100) % 10  : ' ';
+  str[1] = val >= 10 ? '0' + (val / 10) % 10  : ' ';
+  str[2] = '0' + val % 10;
+  str[3] = 0;
 
-      str[0] = val >= 100 ? '0' + (val / 100) % 10  : ' ';
-      str[1] = val >= 10 ? '0' + (val / 10) % 10  : ' ';
-      str[2] = '0' + val % 10;
-      str[3] = 0;
+  LCR_rendererDrawText(str,LCR_EFFECTIVE_RESOLUTION_X -
+    LCR_rendererComputeTextWidth(str,2) - LCR_GUI_GAP,
+    LCR_EFFECTIVE_RESOLUTION_Y - LCR_rendererComputeTextHeight(2) -
+    LCR_GUI_GAP,0,2);
 
-      LCR_rendererDrawText(str,LCR_EFFECTIVE_RESOLUTION_X -
-        LCR_rendererComputeTextWidth(str,2) - LCR_GUI_GAP,
-        LCR_EFFECTIVE_RESOLUTION_Y - LCR_rendererComputeTextHeight(2) -
-        LCR_GUI_GAP,0,2);
+  LCR_gameTimeToStr(LCR_timeTicksToMS(LCR_game.runTime),str);
 
-      LCR_gameTimeToStr(LCR_timeTicksToMS(LCR_game.runTime),str);
+  if (LCR_game.state != LCR_GAME_STATE_RUN_FINISHED)
+    LCR_rendererDrawText(str,LCR_GUI_GAP,LCR_EFFECTIVE_RESOLUTION_Y -
+      LCR_rendererComputeTextHeight(2) - 3 * LCR_GUI_GAP,0,2);
+  else
+    LCR_rendererDrawText(str,((LCR_EFFECTIVE_RESOLUTION_X -
+      LCR_rendererComputeTextWidth(str,4)) / 2),
+      LCR_EFFECTIVE_RESOLUTION_Y / 2,
+      LCR_game.runTime <= LCR_currentMap.targetTime ?
+        LCR_CONVERT_COLOR(0x0700) : LCR_CONVERT_COLOR(0x4208),4);
 
-      if (LCR_game.state != LCR_GAME_STATE_RUN_FINISHED)
-        LCR_rendererDrawText(str,LCR_GUI_GAP,LCR_EFFECTIVE_RESOLUTION_Y -
-          LCR_rendererComputeTextHeight(2) - 3 * LCR_GUI_GAP,0,2);
-      else
-        LCR_rendererDrawText(str,((LCR_EFFECTIVE_RESOLUTION_X -
-          LCR_rendererComputeTextWidth(str,4)) / 2),
-          LCR_EFFECTIVE_RESOLUTION_Y / 2,
-          LCR_game.runTime <= LCR_currentMap.targetTime ?
-            LCR_CONVERT_COLOR(0x0700) : LCR_CONVERT_COLOR(0x4208),4);
+  LCR_gameTimeToStr(LCR_currentMap.targetTime * LCR_RACING_TICK_MS,str);
 
-      LCR_gameTimeToStr(LCR_currentMap.targetTime * LCR_RACING_TICK_MS,str);
-
-      LCR_rendererDrawText(str,LCR_GUI_GAP,LCR_EFFECTIVE_RESOLUTION_Y -
-        LCR_rendererComputeTextHeight(2) - LCR_GUI_GAP,
-        LCR_CONVERT_COLOR(0x4208),2);
-
-      break;
-    }
-  }
+  LCR_rendererDrawText(str,LCR_GUI_GAP,LCR_EFFECTIVE_RESOLUTION_Y -
+    LCR_rendererComputeTextHeight(2) - LCR_GUI_GAP,
+    LCR_CONVERT_COLOR(0x4208),2);
 }
 
 void LCR_gameSaveReplay(void)
diff --git a/map.h b/map.h
index 13d893c..5d791c9 100644
--- a/map.h
+++ b/map.h
@@ -136,9 +136,9 @@
 /**
   Cache for accelerating LCR_mapGetBlockAtFast, consists of 8 2-item records,
   the first record item stores block coord number, the second one stores the
-  value returned by LCR_mapGetBlockAtFast (-1 is 0xffffffff). The record index
-  depends on the block coords: lowest bit is x % 2, middle bit y % 2, highest
-  one z % 2.
+  value returned by LCR_mapGetBlockAtFast (-1 is 0xffffffff, unknown is
+  0xfffffffe). The record index depends on the block coords: lowest bit is x %
+  2, middle bit y % 2, highest one z % 2.
 */
 uint32_t _LCR_mapBlockCache[LCR_MAP_BLOCK_CACHE_SIZE];
 
@@ -160,6 +160,9 @@ struct
 void LCR_makeMapBlock(uint8_t type, uint8_t x, uint8_t y, uint8_t z,
   uint8_t material, uint8_t transform, uint8_t block[LCR_BLOCK_SIZE])
 {
+  x &= 0x3f;
+  y &= 0x3f;
+  z &= 0x3f;
   block[0] = type;
   block[1] = x | (y << 6);
   block[2] = (y >> 2) | (z << 4);
@@ -409,13 +412,19 @@ int LCR_mapGetBlockAtFast(uint8_t x, uint8_t y, uint8_t z,
 {
   // binary search (the blocks are sorted)
 
+  if ((x >= 64) | (y >= 64) | (z >= 64))
+    return -1;
+
   uint32_t n = LCR_mapBlockCoordsToCoordNumber(x,y,z);
   uint8_t cacheIndex = 2 * ((x % 2) | ((y % 2) << 1) | ((z % 2) << 2));
-
+  
   if (_LCR_mapBlockCache[cacheIndex] == n)
-    return
-      (_LCR_mapBlockCache[cacheIndex + 1] != 0xffffffff) ?
-        ((int) _LCR_mapBlockCache[cacheIndex + 1]) : -1;
+    switch (_LCR_mapBlockCache[cacheIndex + 1])
+    {
+      case 0xffffffff: return -1; break;
+      case 0xfffffffe: break;
+      default: return ((int) _LCR_mapBlockCache[cacheIndex + 1]); break;
+    }
 
   _LCR_mapBlockCache[cacheIndex] = n;
 
@@ -710,7 +719,7 @@ uint8_t LCR_mapLoadFromStr(char (*getNextCharFunc)(void), const char *name)
   LCR_LOG2("clearing map block cache")
 
   for (int i = 0; i < LCR_MAP_BLOCK_CACHE_SIZE; ++i)
-    _LCR_mapBlockCache[i] = 0xffffffff;
+    _LCR_mapBlockCache[i] = 0xfffffffe;
 
   _LCR_mapComputeHash();
 
diff --git a/racing.h b/racing.h
index 3dbe761..c624b83 100644
--- a/racing.h
+++ b/racing.h
@@ -81,6 +81,7 @@ typedef int32_t LCR_GameUnit;        ///< abstract game unit
 #define LCR_CAR_STEER_FRICTION ((3 * TPE_F) / 4)
 #define LCR_CAR_ELASTICITY (TPE_F / 64)
 #define LCR_CAR_ACCELERATION (LCR_PHYSICS_UNIT / 9)
+
 #define LCR_CAR_STEER_MAX (LCR_GAME_UNIT / 2)
 #define LCR_CAR_STEER_SPEED 50      ///< 0 to 64, lower is faster
 #define LCR_CAR_STEER_SLOWDOWN 64   ///< slows down steering at higher speeds
@@ -810,7 +811,7 @@ TPE_Vec3 _LCR_racingEnvironmentFunction(TPE_Vec3 point, TPE_Unit maxDist)
 
     for (uint8_t i = 0; i < 8; ++i)
     {
-      /* Black magic: here we make it so that we the lowest coord numbers
+      /* Black magic: here we make it so that we check the lowest coord numbers
         (0,0,0), then the highest (1,1,1), then second lowest (1,0,0), then
         second highest (0,1,1) etc. This way we are narrowing the range (start,
         end) for the binary search. */