Duck Tales - a great port of the NES game - perfect size game for a portable.
Tetris Attack - the sound effects get annoying, and yes, it is scaled down, but still fun.
Donkey Kong - hours of fun for anyone. Great sound effects and stage design.
Zelda Links Awakening - Oh, am I cptn. obvious now? Well, it is the best game on the system, and the best portable Zelda. Item switching can get tedious, but that is the first and last flaw. And I fell in love with Malon! AND the Wind Fish!