I don't own *too* many duplicates. F-1 Race because it's super-cheap and I can do the 4-Player mode with it. Link's Awakening/DX because I love the game and want both versions (and a friend just *gave* me his copy of Link's Awakening, so I've got three). Mario Kart: Super Circuit for the 4-Player mode. Same with Link to the Past/Four Swords (although got the 2-4th copies of MK and LttP relatively cheap). Master of Illusion because I wanted a pack of the cards to keep sealed and a pack of the cards to go with some of my other Nintendo-printed playing cards (and I got the 2nd and 3rd copies for under $5 each). Tetris, Uno, Super Mario DX and Touchmaster for the multi-player and because I got the second copies cheap (and free, in the case of Touchmaster, because Amazon screwed up the item description and said it had single-card download play). Pac-Man because it has a frickin' awesome 2-player mode that's even cooler than Pac-Man vs. Nintendo DS Browser because I've got both the regular and the lite versions. And, of course, FaceBall 200 because it's the awesomest game ever.
Did I miss anything?
