To #5 and #4
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#5. Luigi's Mansion
This game is an absolute blast to play. First of all, you get to play as Luigi (Mario's underappreciated brother). You also get to catch and defeat ghosts in a "GhostBusters" type way. The game offers many ghost types that funtion differently and keep the gameplay from becoming stale. The boss ghosts are also all pretty unique because they all have different powers, ways of beating, and apperances. There is also the crazy Prof. Egad who is a pretty funny character. I also like how they have money you can collect to determin how good you did. But, the best thing about this game was that it marked the first apperance of King Boo, who was a totally awesome final boss. I have beaten this game 5 times so far because it is that fun. To bad the game itself was pretty short.
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#4. Animal Crossing
A never ending game. One of AC biggest advantages over other games is that you could play this game forever and you never officially 100% beat it. There is so much to do. You can catch bugs, find fossils, fish, run errands for others, compete in contests, celebrate holidays, and more. This is my favorite AC game because at the time it was a fresh expierence and I like the overall gameplay better (yes, there are some differences in gameplay). Also, who can forget their first time seeing Tom Nook, K.K. Slider, and Mr. Resseti? I'm never going to forget having to pay Tom Nook back. I also can't forget to mention the fact that AC lets you get NES games and play them! This is probably my favorite simulation game so far. One of the Gamecubes best.
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Down to the Top 3.
P.S. sorry I don't have pictures, for some reason they wouldn't work.