You basically buy the card, install the operating software and then transfer backups of games you already own onto it. This goves you the convenience of having all your games on 1 single cartridge.
The alternative is you can buy the cartridge with the games you already own on it-someone will pre-install them onto the card for you.
i got mine from amazon for around �30 and it fits around 60 gameson,they really are worth the money
look at one of the instruction videos on youtube to see how you download the games onto it.
hi jay1977
its worth the money so you don't have to change your cartridge every 5 minutes and my kids used to be forever losing their game cartridges,so this way you only have one cartridge to worry about.
you are not allowed to download games onto the card just transfer games you already own (used the wrong wording earlier sorry)
anyway i hope it goes well