1 files changed, 3 insertions, 1 deletions
diff --git a/level.c b/level.c
index 2c68335..dbf27da 100644
--- a/level.c
+++ b/level.c
@@ -1,6 +1,7 @@
 #include "level.h"
 #include "lzr.h"
 #include "cfg.h"
+#include <stdlib.h>
 
 static const char level[LEVEL_HEIGHT * LEVEL_WIDTH] = {
 	"000000000000"
@@ -28,7 +29,8 @@ void level_draw()
 	for (int x = 0; x < LEVEL_WIDTH; x++) {
 		const int dx = (x + 3) * CFG_TSIZE;
 		const int dy = y * CFG_TSIZE;
-		if (level_get(x, y) == '0')
+		if (level_get(x, y) == '0' && ((rand() & 3) == 3 ||
+		    LZR_GetTick() & 1))
 			LZR_DrawRectangle(true, dx, dy, CFG_TSIZE, CFG_TSIZE);
 	}
 }