If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Grab the carrots and weapons to take down your enemies. Don't let the monsters kill Bugs Bunny.
Left / Right Arrow Keys - Move.
Spacebar - Jump.
Up / Down Arrow Keys - Change floors when you are at the edge of the board.
A - Plant the Anvil Trap.
M - Plant the Monstoids Trap.