Use the left and right arrow keys to move, and the up arrow to jump.
Press X to throw a cross (crosses will destroy zombies, naturally).
Touching a zombie will kill Father O?Malley; letting the rising lava touch him will have a similar effect.
Run to the right edge of each level as quickly as possible to avoid the lava and advance to the next level. There are 20 levels in total, with the number of zombies and the rate at which the lava rises increasing in each level.
(Protip: during the second or two when the zombies are climbing out of the ground, they cannot kill you, so it is possible to run through them at the very instant they appear, with a little luck.)
You can control the volume the the + and ? keys, and mute with the zero key.
