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Can't say I've got that many games, Sonic Rush is good, but may be a bit of a suprise if you were expecting something similar to the MegaDrive games. Apparently it carries on more from the Sonic Advance series, which I never played. Regardless, it's quite a fun game, not a vast number of levels (it is a Sonic game), but some of the boss battles are very challenging.
Oh, Advance Wars DS also. Haven't got it meself, but have got my hands on both the GBA versions, both lasted me plenty of time doing the campaign modes, and theres the bonus that you can play multiplayer games with only one cart and GBA/DS because it's turn-based. There's also the vs. battles to play against the CPU... It's just extra missions pretty much like the campaign, but with no storyline to it...