Sailboat Games Can You Help Create A Game Using A Simple Machine For 3rd Grade Level?

Can you help create a game using a simple machine for 3rd grade level? - sailboat games

My 8 years old son needs to create a game with a single machine. The game must have at least 3 rules and need to work with. Examples of simple machines, which have expressed: a lever (hammer, pliers with ice), the wheel / Axel (gear, the people affected), inclined plane (slope, hill), screws (cork screw), wedge (knife holder, door stoppers ) and roles (mast sailboat, a crane).