@KZadBhat, Anon is talking about the SNES game Super Noah's ark 3D. I don't know if it was the only unlicensed SNES game or not but yeah there were many unlicensed NES titles.
@Anon-e-moose, it's not like the SNES version of Wolfenstein was any better. The SNES simply wasn't made for FPS games. Doom for the SNES was an impressive feat in that it was made at all but it was trash. That system just couldn't handle FPS games.