Castlevania: Dawn of Sorrow
An incredible game - the tried-and-true GBA Castlevania action-RPG formula is performed excellently, soul-collection is rarely too tedious (though it can happen), and the weapon upgrading system is purely brilliant. The handiness of the top screen map/stat-display can't be overstated, and while the touch screen isn't used very often (breaking away some blocks or drawing a magic seal), when it comes up it doesn't seem intrusive at all. There's even an unlockable extra mode where you can play as Julius Belmont and friends ala classic 'Vania. It's the first game in a very long time for which I've been compelled to do all the extra stuff. One of the awesomest games I've played in quite a while, portable or otherwise.
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