Hello. I'm not sure if this is a stupid question, but I haven't got an answer for it. I've ordered my son a Nintendo DSi XL which is coming sometime this week. I've never seen one of these and I'm told they haven't got a cartridge slot. I've been reading up on the DSTWO, but why would I need the cartridge if there is no slot? Couldn't I just download the DSTWO firmware, slap it on a memory stick then bobs your uncle? Or am I mistaken somewhere. Any help would be appreciated. Thanks, Matt.