Blaster Master: Blasting Again (PS1)
I'm having a surprising amount of fun with this one for a $1.95 complete-in-case used game. Haven't gotten my hands on the GBC BlasterMaster yet, but short of seeing that, this sequel does seem the most playable and true to the original. They even nailed SOPHIA-physics- nothing makes precision platforming more fun than adding rollerskates
Difficulty is probably comparable to NES, possibly a fraction lower, but this time around you actually get save files, meaning the game is actually completable by means other than raw repetition. Music is solid, controls generally make sense even if certain maneuvers get awkward once you have all the abilities. The only severe downside is load time- 8-15 seconds between rooms on a PS2. I suspect emulation from ISO would be a serious improvement. Also... plot. I'm not normally one to complain about adding deep plot to games of other genres, but BM:BA borders on melodrama by the end >_<