If you've never tested your brain for picross compatibility, you can do so today with the latest Virtual Console game on eShop. Try Mario's Picross
and you'll either have an awesome time making little pixel pictures out of number puzzles, or throw your 3DS down the stairs. Good thing the price for replacements is going down
WiiWare offers a novel take on the racing genre: Monochrome Racing
(also out on PS Minis), a game that takes place in a fully monochrome environment, in which you must keep your car "charged" and moving with color by picking up items.