The old DS and the DS Lite are practically the same except for battery life and the size of the console. Lite is smaller and has better battery life. They can both play DS and GBA games. The DSi has the worst battery life of them all and the DSi can not play GBA games. DSi is also more expensive and is practically the same size of the DS. DO NOT BUY A DSi !!!!!! If you want to take .3 mp pictures than go ahead and throw away your money with the DSi!!!!!