Vermin is a game based around the popular mechanical game "Whack-A-Mole". You'll see the ground move around the hole... and when a mole appears from that hole, you have to move quickly and whack it!

The Exterminator character has his arms outstretched and will automatically strike moles when they appear below his hammer. Moles directly below the Exterminator, or outside the Exterminator's reach, won't be hit and will require the player to re-position themselves. The game gets faster as you strike down more moles, and you only get three mistakes before the game is over.

The only difference between GAME A and GAME B is the number of holes: GAME A has only four holes, while GAME B has five holes to manage. The maximum achievable score is 999.