The cover tricks you by saying it has codes that work. It doesn't! I gotmine at a Gamestop in a mall closest to me. It worked for Super Mario Bros. & only the Dalmation & Friends nintendogs version and when I tried to load more of the games I had on to the game, it took more than 3 days to be done with it. then when I tried to use it, it wouldn't even come on! You know how when you turn the DS on, it comes up with a screen that you can choose your game, or pictochat it totally skipped that! But when I put in a nintendo gane, it worked. So I returned it a week later and got my money back. The guy that worked there said he got 9 out of 10 back. So I recommend staying away from it. LISTEN< IF YOU BUY IT CONSIDERD YOUR SELF WARNED!!