I like what tcaud said, I like it a lot.
I'd recommend you follow his advice.
I go on tvtropes.org, they seem to have aspergers ocd and point out fimilarities and stuff that is extremely repetitive. So I go on and check out what they say for RPG games, which invariably is often for NES/SNES sprited games. They say in one of the tropes, that for any rpg-style game, your extremely likely to have a lava level, a forrest level, a mine, a town, etc, a water level, and a few others.