Actraiser was a SNES game that was so unique that I am pretty sure there has never been a game like it ever since. The game starts out as a 2D side-scroller, like Castlevania, but after completing a stage, the game turns into a SimCity-like simulation where you try to rebuild a town that has been under attack by demons. The action was epic, the simulation addictive and the music, especially this song from the first Blood Pool stage, was tremendous. Truly a hidden gem.
[youtube]http://www.youtube.com/watch?v=Wsefax53YP0[/youtube]