Belmont's Revenge. It has a very peculiar atmosphere to it, partly because of the stark Game Boy minimalism inherent to the platform, which is something I have a great fondness for. It makes me want to look past the obvious and immerse myself in the world it depicts, in all its monochromatic glory. There are so many things that build it a strong, individual identity: unique enemy designs, stage concepts otherwise unexplored elsewhere in the series, the quaint presence of the themed castles, and perhaps most enduringly, the limitations-shattering soundtrack. Tracks like Praying Hands and Castle #2 contain such immense mystery and depth of expression that I can't even fathom it.