This game is the same principal as pin the tail on the donkey. Instead of a donkey, you make a map of Mars. All you need is a large piece of plain paper about a meter square. A double page from a newspaper will do in a pinch. Attach the paper to a tree with tape or lay it on the ground. The paper represents a space map of the universe. The with a heavy red crayon draw a solid color disc about 3" in diameter on the space map. This red ball will be Mars. Next draw on several other planets. Each player gets to make a spaceship. Blindfold each player, spin him around and see if he can land his ship on mars. Make sure each ship has the child's name on it so you can tell who is the closest. The closest ship to the center of Mars wins.