3 x 3 Rubik's Keychain Cube. If you are stylish and want to derive entertainment while on the move, you can buy one of those 3x3 Rubiks keychain cube. Attractively designed and made from the best available materials, these games are a must have for everyone. It does serve the dual purpose of a game as well as a keychain. It is durable and you can use it for a very long time. they also make excellent gifts.