Super Smash Bros. Melee (Player's Choice) for GameCube
It's hard to think of much to say about Super Smash Bros. Melee that hasn't been said before, really. The original Super Smash Bros. for the N64 was definitely a fun little curiosity- it featured a unique take on the fighter formula that only had a very vague predecessor in Namco's "The Outfoxies", with some of Nintendo's most popular characters (and some original ones) 'avin' a bit've a punch up- and though it was by all measures a success, it could hardly be said to have set the world on fire. Melee, on the other hand, did; the roster was greatly expanded (including a number of cult characters alongside the familiar faces), the number of stages upped, the engine further refined and built on, and a host of collectibles and unlockable extras (including the now series-staple Trophies) were added to encourage replayability are just some of the expansions and upgrades the game recieved. We would also be remiss to mention that no other game has had the longevity it has enjoyed specifically because of the way exploits, glitches, and other unintended tricks caused by quirks and oversights in the programming changed the way the game plays - particularly in high-level tournament play, the meta-game is ever changing and growing even in the modern day.