3DS Downloadable Titles: Pushmo Crashmo Mighty Switch Force Mighty Switch Force 2 Harmoknight VVVVVV Ketzal's Corridors Cave Story Mario and Donkey Kong: Minis on the Move
DSiWare: Puzzle League Express Amoebattle Mario vs. Donkey Kong: Minis March Again! Art Style: PiCTOBiTS
VC: Legend of Zelda: Link's Awakening LOZ: Oracle of Ages LOZ: Oracle of Seasons Donkey Kong (Game Boy) Catrap Super Mario Bros. Super Mario Bros. Lost Levels
These are my favorites in particular. This is way more than $21.00 worth, so pick out some interesting ones based on your impressions from their eShop info. There's plenty more, as well; if you want to go searching for yourself, your best bet is to stay on the front page for the good ones.
I'm not exactly "normal." Hope this isn't a problem. Need something to do? Here's a maze: http://i.imgur.com/HSMCf.png