From the publisher's website:

Build a better mousetrap? We dare you. Naturally, the object is to trap mice in the mousetrap, while avoiding getting trapped. By rolling the die, you proceed around the game board, collecting cheese pieces and building a mousetrap bit by bit. Once complete, you set the wheels in motion, as it were, to try to capture the opposition's mice. But this is no ordinary trap. With this contraption you start by turning the crank, that rotates the gears, that push the lever, that moves the shoe, that kicks the bucket, that sends the ball down the stairs and into the gutter, that leads to the rod that releases a second ball, that falls through the bathtub and onto the springboard, that catapults the diver into the washtub, that causes the cage to fall and--whew!--hopefully, capture a mouse. The last "mouse" left uncaptured wins