I beat the Xbox 360 version of this game on March 11th, 2011. I obtained all 3/3 achievements.
I beat the Arcade version of this game. I later beat the Arcade version of this game again on December 5th, 2007 with my brother at the Killeen, Texas mall. I was Wolverine and he was Cyclops. I think I ended with 331 kills while he had something around 211. It was selling for $645, and we actually considered buying it. Thankfully, we didn't actually go through with it.
I beat the Xbox 360 (XBLA) version of this game on December 19th, 2010. I beat both the U.S. and Japan versions of the game. I also got 12/12 achievements for a total of 200 Gamerscore. I beat it on co-op with my brother on February 2nd, 2011. We beat both the U.S. and Japan versions of the game. We watched Groundhog Day afterward!
I beat the Sega Genesis version of this game. Nightcrawler and Gambit are da bomb! I played this a bunch with my friend Ruben.
I beat the Xbox 360 version of this game on November 27th, 2009. Fun game.