diff --git a/assets-cg/icon-sel.png b/assets-cg/icon-sel.png
index 7137b50..a706959 100644
Binary files a/assets-cg/icon-sel.png and b/assets-cg/icon-sel.png differ
diff --git a/assets-cg/icon-uns.png b/assets-cg/icon-uns.png
index 3c99f62..fdaa9ca 100644
Binary files a/assets-cg/icon-uns.png and b/assets-cg/icon-uns.png differ
diff --git a/assets-cg/icon.xcf b/assets-cg/icon.xcf
new file mode 100644
index 0000000..bf08502
Binary files /dev/null and b/assets-cg/icon.xcf differ
diff --git a/src/duet.h b/src/duet.h
index dccb064..8b1681a 100644
--- a/src/duet.h
+++ b/src/duet.h
@@ -60,7 +60,7 @@ typedef struct {
 #define PLAYER_X 60
 #define PLAYER_R 40
 #define PLAYER_SIZE 8
-#define CORRIDOR_SIZE 120
+#define CORRIDOR_SIZE 138
 
 #define RECT_SPEED 50 /* px/tempo */
 
diff --git a/src/main.c b/src/main.c
index 2ef3dd9..0bf59da 100644
--- a/src/main.c
+++ b/src/main.c
@@ -44,7 +44,7 @@ int main(void)
     __printf_enable_fp();
 
     memset(&game, 0x00, sizeof game);
-    game.level = &level3;
+    game.level = &level4;
     game.current = game.level->blocks;
     game.time = -5.0;
 
diff --git a/src/physics.c b/src/physics.c
index a003dec..57be031 100644
--- a/src/physics.c
+++ b/src/physics.c
@@ -95,10 +95,10 @@ void rect_load(rect_t *r, rectmeta_t const *meta)
 
     switch(meta->position) {
     case Position_Left:
-        r->y = DHEIGHT/2 - CORRIDOR_SIZE/2 + r->w/2;
+        r->y = DHEIGHT/2 - CORRIDOR_SIZE/2 + r->h/2;
         break;
     case Position_Right:
-        r->y = DHEIGHT/2 + CORRIDOR_SIZE/2 - r->w/2;
+        r->y = DHEIGHT/2 + CORRIDOR_SIZE/2 - r->h/2;
         break;
     case Position_Middle:
         r->y = DHEIGHT/2;