Pause:
Press * to pause your game.

Freeze all enemies:
Collect the prize in the middle of the screen while the "Extra" apple at the top of the screen is on a red letter.

Shoot through walls:
Mr Do can shoot through tunnels that are separated by very thin walls.

Flattened Mr. Do:
Cause two adjacent apples to fall and intentionally get underneath the first apple. Mr. Do will be flattened, but will not lost a life. REMEMBER: The game must be restarted to continue.