This is a simple PA Lib example of a tank. Once you have it running on your DS, you can drag the white circle on the bottom screen to turn the turret, and use the D-Pad to control the tank. The source code is included, and you are free to do whatever you want with it. I have included .nds, .ds.gba and .sc.nds versions, although I have only tested it on a GBAMP v2 w/ FlashMe. And yes, I drew the tank sprites myself - not bad for a programmer, right?