Want to play?  Yeah, word.  Me too.  If you have a webcam, download and print the marker and play away.

And for those that speak geek, we love you, and you should cop this:  FLARToolKit (an AS3 port of the Open Source library ARToolKit) will let you detect a marker from an input image and calculate the camera position in 3D space.  Use it with a 3D engine of your chouse and build your own Augmented Reality applications.  Don’t forget to thank Japanese coder Saqoosha for the toolkit.