Your task is to transform twelve famous monuments into clocks!
To do this you'll have to build complex but perfectly working gears, composed by many toothed wheels of different dimension. Of course you have limited time to do so and a couple of nasty critters constantly try to hamper your efforts (not to mention additional difficulties in later levels like cogwheels turning only in one direction, etc.).
To help you, every few stages you may get some bonuses playing a "slot machine" mini-game.