diff --git a/modules/game/level.scm b/modules/game/level.scm
index 3f0ee31..95cea99 100644
--- a/modules/game/level.scm
+++ b/modules/game/level.scm
@@ -66,7 +66,7 @@
                  (y (bytevector-u8-ref objects (+ i 1)))
                  (id (bytevector-u8-ref objects (+ i 2)))
                  (obj (match id
-                        (1 (spawn ^wall x y 'brick))
+                        (1 (spawn ^wall x y 'inert))
                         (2 (spawn ^wall x y 'copper))
                         (3 (spawn ^player x y))
                         (4 (spawn ^exit x y))
diff --git a/modules/game/levels/level-2.tmx b/modules/game/levels/level-2.tmx
index 0c8ac10..5f15d26 100644
--- a/modules/game/levels/level-2.tmx
+++ b/modules/game/levels/level-2.tmx
@@ -3,21 +3,21 @@
  <tileset firstgid="1" source="tiles.tsx"/>
  <layer id="1" name="background" width="20" height="15">
   <data encoding="csv">
-23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,
-23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,
-23,23,23,23,23,23,24,24,24,24,24,24,24,24,23,23,23,23,23,23,
-23,23,23,23,23,23,24,24,24,28,24,24,24,24,23,23,23,23,23,23,
-23,23,23,23,23,23,24,24,24,24,24,24,24,24,23,23,23,23,23,23,
-23,23,23,23,23,23,24,24,24,24,24,24,24,24,23,23,23,23,23,23,
-23,23,23,23,23,23,24,24,24,24,24,24,24,24,23,23,23,23,23,23,
-23,23,23,23,23,23,23,23,23,23,24,23,23,23,23,23,23,23,23,23,
-23,23,23,23,23,23,23,23,23,24,24,24,23,23,23,23,23,23,23,23,
-23,23,23,23,23,23,23,24,24,24,24,24,24,23,23,23,23,23,23,23,
-23,23,23,23,23,23,24,24,24,24,24,24,24,24,23,23,23,23,23,23,
-23,23,23,23,23,23,24,24,24,24,24,24,24,24,23,23,23,23,23,23,
-23,23,23,23,23,23,23,24,24,24,24,24,24,23,23,23,23,23,23,23,
-23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,
-23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23
+130,211,129,170,171,190,109,191,129,191,191,171,91,190,110,211,171,209,150,130,
+189,211,210,89,111,81,82,82,82,82,82,83,83,82,84,91,151,91,129,209,
+211,209,209,171,111,105,24,24,24,24,24,24,24,24,86,210,89,130,191,170,
+170,209,91,170,111,105,24,24,24,28,24,24,24,24,86,131,129,129,170,131,
+130,209,89,129,211,105,24,24,24,24,24,24,24,24,106,209,211,90,211,149,
+111,89,191,151,151,105,24,24,24,24,24,24,24,24,106,131,150,151,91,149,
+109,191,169,209,89,85,24,24,24,24,24,24,24,24,86,211,130,150,129,190,
+91,171,151,131,211,101,102,102,81,82,24,83,84,102,104,189,211,189,169,109,
+89,170,150,209,131,171,81,83,108,24,24,24,107,84,169,151,131,111,191,191,
+130,129,190,209,91,81,108,24,24,24,24,24,24,107,84,131,111,109,189,211,
+171,190,149,189,211,105,24,24,24,24,24,24,24,24,106,131,129,89,90,170,
+191,170,91,169,210,105,24,24,24,24,24,24,24,24,86,129,211,110,191,129,
+130,149,129,109,171,101,88,24,24,24,24,24,24,87,104,111,169,190,110,150,
+149,129,89,129,111,190,101,102,102,102,103,102,102,104,91,90,211,190,151,169,
+150,111,131,210,151,151,130,211,111,210,90,90,130,150,190,109,129,90,190,169
 </data>
  </layer>
  <objectgroup id="2" name="objects">
diff --git a/modules/game/levels/level-3.tmx b/modules/game/levels/level-3.tmx
index fe492a7..3f309bd 100644
--- a/modules/game/levels/level-3.tmx
+++ b/modules/game/levels/level-3.tmx
@@ -3,8 +3,8 @@
  <tileset firstgid="1" source="tiles.tsx"/>
  <layer id="1" name="background" width="20" height="15">
   <data encoding="csv">
-23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,
-81,83,83,82,83,83,83,82,83,83,83,83,82,83,83,84,23,23,23,23,
+170,130,151,211,150,151,171,110,190,91,91,189,171,111,130,150,170,150,210,150,
+81,83,83,82,83,83,83,82,83,83,83,83,82,83,83,84,131,89,169,109,
 85,24,24,24,24,24,24,24,24,24,24,24,24,24,24,106,81,82,82,84,
 105,24,24,24,24,24,24,24,24,24,24,24,24,24,24,106,105,24,24,86,
 105,24,24,3,3,24,3,3,3,3,3,3,24,24,24,106,105,24,24,106,
@@ -12,12 +12,12 @@
 85,24,24,24,24,24,24,3,3,3,3,3,24,24,24,24,24,24,24,106,
 85,24,24,24,24,24,24,24,24,24,24,24,24,24,24,106,105,24,24,106,
 85,24,24,24,24,24,24,24,24,24,24,24,24,24,24,106,105,28,24,86,
-105,24,24,24,24,24,24,24,24,24,24,24,24,24,81,104,105,24,24,86,
-105,24,3,3,24,61,61,66,24,24,24,24,24,24,106,23,105,24,24,86,
-85,24,24,24,24,24,24,64,61,61,24,3,3,24,86,23,101,102,102,104,
-101,103,103,102,102,102,103,102,103,103,102,102,102,102,104,23,23,23,23,23,
-23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,
-23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23
+105,24,24,24,24,24,24,24,24,24,24,24,24,24,87,104,105,24,24,86,
+105,24,3,3,24,61,61,66,24,24,24,24,24,24,106,130,105,24,24,86,
+85,24,24,24,24,24,24,64,61,61,24,3,3,24,86,109,101,102,102,104,
+101,103,103,102,102,102,103,102,103,103,102,102,102,102,104,170,189,131,150,189,
+91,191,211,110,171,209,170,110,170,111,91,111,171,211,110,210,149,89,109,130,
+170,151,171,111,209,110,89,150,90,90,111,209,189,131,130,110,171,211,209,169
 </data>
  </layer>
  <objectgroup id="2" name="objects">
diff --git a/modules/game/levels/tiles.tsx b/modules/game/levels/tiles.tsx
index b8335e5..a19bdcc 100644
--- a/modules/game/levels/tiles.tsx
+++ b/modules/game/levels/tiles.tsx
@@ -6,90 +6,85 @@
    <property name="kind" value="copper"/>
   </properties>
  </tile>
- <tile id="22" type="wall">
-  <properties>
-   <property name="kind" value="brick"/>
-  </properties>
- </tile>
  <tile id="27" type="exit"/>
  <tile id="80" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="81" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="82" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="83" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="84" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="85" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="86" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="87" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="100" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="101" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="102" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="103" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="104" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="105" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="106" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
  <tile id="107" type="wall">
   <properties>
-   <property name="kind" value="brick"/>
+   <property name="kind" value="inert"/>
   </properties>
  </tile>
 </tileset>
diff --git a/scripts/compile-map.scm b/scripts/compile-map.scm
index 160b8b3..be2c868 100644
--- a/scripts/compile-map.scm
+++ b/scripts/compile-map.scm
@@ -547,7 +547,7 @@ the default ORIENTATION value of 'orthogonal' is supported."
         (y-loop (1+ y))))
     bv))
 
-(define obj:wall:brick 1)
+(define obj:wall:inert 1)
 (define obj:wall:copper 2)
 (define obj:player-spawn 3)
 (define obj:exit 4)
@@ -579,7 +579,7 @@ the default ORIENTATION value of 'orthogonal' is supported."
                            (#f #f)
                            ("wall"
                             (match (assq-ref (tile-properties tile) 'kind)
-                              ("brick" (list x y obj:wall:brick))
+                              ("inert" (list x y obj:wall:inert))
                               ("copper" (list x y obj:wall:copper))
                               (kind (error "unsupported wall kind" kind))))
                            ("exit" (list x y obj:exit))