Fire Emblem: Awakening is in my top three most favorite handheld games of all time, and I just got it today.
It's really fun, challenging, and you gotsta use your noggin. It has all the best aspects of a terrific strategy game, but man! You make one wrong move, and all your hopes and dreams, all your heart, spirit, and soul will be crushed to smithereens right in front of your eyes...