use space (and/or letter a only if 500 zombies are dead)to kill zombies The boss shall enter the fray when you kill 1000 zombies. -> UPDATE: New bboss. -> AK 12 Lives set back to 1000 after Bowser death. He has 5000 lives and you have 500. Kill him and Venom to win the game It's that simple BY THE WAY, THIS CAN BE WON(I did it myself)