Final Fight 2, the sequel to Final Fight, was never an arcade release but went straight to console and did remarkably well.  Despite the first Final Fight being kind of a rush job for the SNES, Final Fight 2 was refined and pretty much better in every way: 3-character select screen; 2-player selection; options menu - and those were the big ones.  Well, fans of the game decided to refine it just a little more with Minor Improvements by SCD which makes small but welcomed changes and Readjusted by GameHackFan which allows more enemies to be on the screen at one time (with very little flickering and slowdown but not enough to take away the experience).  Adding MSU-1 to the mix makes it more like your playing in the arcade.