I have Children of Mana which is decent, FFIII which I enjoyed, Mario Cart which is good, Tetris, which I can enjoy and beat people down in fairly regularly, Castlevania: Portrait of Ruin which is a good game, although the last boss is quite difficult, Dragon Warrior: Rocket Slime which is fun and punny, and finally, my personal favorite:

Osu! Tatakae! Ouendan