FunkyCami
Bro... this game better get re-released soon (EDIT : on something other than a console dead on launch). With masterfully well made dungeons, a memorable soundtrack and graphics that aged near perfectly, this game is a classic. The pacing does get a bit bad toward the end, so get yourself a podcast or two while playing.
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Feels weird ay? Not that it's a bad game, but most people know there's an entire level lacking. If you want the full experience, check out the arcade version-- and if you really like the NES version, play the 3DS special edition where they added the factory level! Anyway, really short, but still fun.