Mario Tennis and Super Monkey Ball are fun, although not everyone is into them. It depends what kind of games you like. If you are into racing games, they made burnout 2 for gamecube, although it's hard to find. Wave Race: Blue Storm is pretty good too. If you like fighting games, Soulcalibur II is excellent, and the gamecube version has Link, which is kick ass. There is also Super Smash Bros. Melee, which is oddly fun. For an RPG, Paper mario is interesting. Prince of Persia is a good action game. I haven't played Eternal Darkness, but it looks very good. If you like sports games, NBA Street V3 is fun, various Tonk Hawk games, NFL street and Tiger Woods. I haven't played Pikmin and Star Fox Adventures, but they are well regarded.