The Whack-a-tofu game is a mini game in the Trool Fair.
It is found at (-13,-39). Talk to Pat Pott to play, it costs 20 kamas.
The aim of the game is to hit the yellow Tofus as they appear. However, you must avoid hitting the orange Tofus.
If you hit 60 yellow Tofus in a row, you win 10 Trool Fair Tokens.