Attention: Old PyARTK module is obsolete for a long time. Now the new ARTKBlender module is available. It works on current version of Blender and provides similar functionality as old one.
I was requested to create demo with two ARTK markers to control game objects directly. I just made modifications to artkdemo – lower layer now contains simple game controlled by markers. I didn’t change any script in demo, just set up objects and added the second pattern data file.