This is a game we came up with a couple of weeks ago... just thought we would finally let someone know about it. It is also on the hanging city map we made which can be found here:
http://www.planetminecraft.com/project/hanging-city-382511/

It is also meant to be used on a multi-player sever as it requires two people to play. All the instructions you need to know are on signs inside of the game. The total space requirement is only one chunk!
Thanks!

Also, I would really appreciate some feedback!