Draw out a large space map of the universe, including several planets. Then with a heavy red crayon draw a solid colour disc about 3"; in diameter somewhere on the space map. This red ball will be Mars. Also make enough rockets for each player. Now blindfold each player, spin them around and see if they can land their ship on Mars. Once placed the blindfold is removed the player can elect to have another go, in which case the rocket is removed or their name is written on the rocket. The closet to Mars wins.
Source: From the original site.