The 1990s were tough on Sunsoft. Though they had years of experience in creating video games for the Nintendo Entertainment System, culminating in some of the console's best games, the NES' waning popularity at the time resulted in some of these games never seeing the light of day in the United States.
The now-infamous U*fouria and Mr. Gimmick were two Sunsoft games that were advertised and prepared for US release, but later cancelled. Both were highly-praised games that suffered only from their own obscurity; English versions of both games saw exclusive, limited releases in parts of Europe late in the NES' lifespan.
However, one of Sunsoft's games didn't see release anywhere in the world, not even in its native Japan. And unlike Mr. Gimmick and U*fouria, this game was never even announced for release, rendering it completely unknown in the video gaming world. The name of this mysterious game was…Sunman.