After having eaten very heavily just before going to bed, Garfield finds himself trapped in a nightmare from which he must escape and where he lives through all of his nine "lives". Amusingly, this is unrelated to a similarly-titled story collection.

The game is a sidescrolling platformer, which is divided into 9 levels. Each level represents one of Garfield's lives (though this implies Garfield has lived an entire life in the sewer and another in a tree...). To complete the level, Garfield must fulfill a goal which is given at the beginning, like finding 10 eggs or getting the key to a door. After three levels, there is always a boss fight. Apart from jumping, Garfield can kick to get rid of his foes and he can perform a ramming attack and an elbow blow.

tormented runs through the game in 10 minutes and 7.79 seconds.