diff --git a/games/boybomb.p8 b/games/boybomb.p8
index 1b831c2..0ce8237 100644
--- a/games/boybomb.p8
+++ b/games/boybomb.p8
@@ -174,14 +174,20 @@ function start_level(n)
     last_gravity = t()
     exploding = false
     level_dets = 0
-
+    level_boxes = 0
     level_num = n
     level = levels[n]
+    -- load puzzle
     puzzle_grid = {}
     for y=1,GRID_H do
         puzzle_grid[y] = {0, 0, 0, 0, 0, 0, 0, 0}
         for x=1,GRID_W do
             puzzle_grid[y][x] = mget(x+level.mapx-1, y+level.mapy-1)
+            if puzzle_grid[y][x] == GRID_EMPTY then
+                puzzle_grid[y][x] = 0
+            elseif puzzle_grid[y][x] ~= 0 then
+                level_boxes += 1
+            end
         end
     end
     bomb_x = level.bomb_x
@@ -241,7 +247,7 @@ function draw_level()
     print("par    "..level.par, jx, 24, 11)
     print("dets   "..level_dets, jx, 32, 11)
     print("chain  "..10, jx, 40, 11)
-    print("crates "..10, jx, 48, 11)
+    print("crates "..level_boxes, jx, 48, 11)
     spr(level.boss, 10, 108, 1, 2)
     print("stay still and don't \nexplode. we're here to help", 20, 110, 7)
 
@@ -254,7 +260,7 @@ end
 function can_move(dx, dy)
     local ny = bomb_y+dy
     local nx = bomb_x+dx
-    if ny == 0 or ny > 8 or nx == 0 or nx > 8 then
+    if ny == 0 or ny > GRID_H-1 or nx == 0 or nx > 8 then
         return false
     end
     if puzzle_grid[ny][nx] ~= 0 then
@@ -403,7 +409,8 @@ _scenes.level = {start=nil, draw=draw_level, update=update_level}
 total_dets = 0
 
 GRID_W = 8
-GRID_H = 9
+GRID_H = 11
+GRID_EMPTY = 136
 BOX_WOOD = 137
 BOX_STEEL = 138
 BOX_FIRE = 139
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@@ -554,17 +561,17 @@ __map__
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