The aim of the game is to hit all the strange creatures when they come out of their warrens before they go back in.
You need to hit some enemies more than once. Keep hitting them until they explode.
If you hit an empty hole or an enemy escapes before you can hit it, you'll lose energy.
You'll get hearts or coins from some enemies when you flatten them. Hit them with your hammer to pick them up and get extra energy or money to spend in the shop.
Icons with arrows will sometimes appear. If you hit them, the keyboard will be reconfigured. Up keys become down keys or left keys right keys.
Use number keys to squash the enemies that come out of the holes.
Keys 1, 2 and 3 whack the top row, keys 4, 5 and 6 the middle row and keys 7, 8 and 9 the bottom row.
If you press the left select key (or the letter Q on Blackberry mobile phones) the pause menu will pop up.