Workshop › Puzzle Bobble-style Bubble Shooter › Step 24 of 31

The ceiling comes down

What we are doing

Now drop moves everything: the bubbles are placed lower, the ceiling that stops a shot is lower, and the ceiling is drawn as a thicker block.

```js
const cellPos = (r, c) => ({ x: R + c * 2 * R + (r % 2) * R, y: TOP + drop * ROW_H + R + r * ROW_H })

  if (y - R <= TOP + drop * ROW_H) return true

  // The ceiling comes down as a solid block.
  ctx.fillStyle = '#312e81'
  ctx.fillRect(0, 0, canvas.width, TOP + drop * ROW_H)
```

What it means

• Every row's height on screen gets drop * ROW_H added.
• A shot stops at the lowered ceiling, and the ceiling block is drawn that much taller.

Your turn

1. In cellPos, add drop * ROW_H + after TOP + .
2. In touches, change the ceiling check.
3. In draw, add the comment and use the new height for the ceiling.

Skills: Game states

← Count the shots Win or lose →

All steps

1. The night sky
2. One bubble
3. A grid of cells
4. Draw the grid
5. Bubbles that nest
6. The shooter
7. Aim upwards
8. Turn with the arrows
9. Aim with the pointer
10. Fire!
11. Fly
12. Bounce off the walls
13. Touching something?
14. Stick into the grid
15. Smaller steps
16. Six neighbours
17. Flood fill
18. Three in a row pop
19. Bubbles that fall
20. Cut them loose
21. Show the score
22. Only useful colors
23. Count the shots
24. The ceiling comes down
25. Win or lose
26. The danger line
27. The end message
28. Play again
29. Best score
30. A dotted guide
31. Build it yourself: swap bubbles