Reminds me of how MIke Oldfield distributes his "Tres Lunas" "game". You can download the Demo (I think), and "unlock" the full version via credit card. Sad I don't have one.

When you find a big kettle of crazy, it's best not to stir it.
--Dilbert cartoon

"Interplay.some zombiefied unlife thing going on there" - skavenhorde at RPGWatch