Yes, a graphing calculator. Goto
www.ticalc.org, fallow the link to the fat libs homepage (the fat library is the 3d engine library), then goto the message board, and look under the fat board. The creator of coridor 92 (which is now avalible for the 89 also) has made a program to extract the maps and sprites from the game, and coridor 92 all ready has all of the features that wolf had. He is going on a navy ship or something, and if all goes well, when he gets back in august, he should have an amazing game for us.