So many old memories...Yet my 5 are:
1. Sonic series
2. Almost any racing game
3. Armored Core series (I feel like a terrorist when I play this
)
4. Mario series
5. Anything along the lines of blowy-uppy, strategy, flying, etc.
Now waiting for: Zoids Battle Legends for Gamecube. Death to the friggin' Liger Zero!