i should be a mmorpg set in space, medievil, or something else
you would get it for free but you could also purcase expansions
you could chat make friends, or do stuff
of course, you would need a internet connection
also, u wouldnt have to create an account, because you could just use your dsi profile
I would make a homebrew so that every on can play ds and dsiware from that app but... you have to get a sd card so you can download the game to the sd card insted of the dsi.