I completely missed the release of the ROM image of the unreleased localization of Metal Jack for the SNES (about 1.5 years ago), but after discovering it, I decided to make an article on the game. The game is pretty much the same as the Japanese version, but the setting is changed from Tokyo to Los Angeles. There was a bit of coverage of the game in Gamepro and EGM. Clearly Atlus must have decided it wasn't worth releasing. http://www.snescentral.com/review.php?id=1076&num=0&fancy=yes&article=proto
