Donkey Kong Country 2 is my personal favorite platformer. The mechanics feel smooth and are timeless, as well the varied play-styles between Diddy and Dixie make the game super enjoyable. Collectibles actually pertain to relevance, soundtrack is one of my personal favorites on the Super Nintendo, boss fights are awesome, characters are memorable, and it's a graphics are excellent for that time period. The game was also sizable and the game mechanics with in the levels had tons of variety and creativity. It really pushed the limit of what the Super Nintendo could do and was one of those game changing sequels to an already awesome predecessor. Some could classify the entire trilogy, which personally if I had to pick only one, I would pick the second one. For the three dimensional platformers it would have to be Mario 64 and this is for many of the same reasons as I listed DKC2. The 90's was the era of the platformer, I do not know how beyond the new millennium we have not had anything like those games in the platformer department.