The Nintendo DS is region free in the sense that any console will run a Nintendo DS game purchased anywhere in the world; however, the Chinese version games can only be played on the Chinese iQue DS, whose larger firmware chip contains the required Chinese character glyph images. Although the Nintendo DS of other regions cannot play the Chinese games, the iQue DS can play games of other regions. Also, as with Game Boy games, some games that require both players to have a Nintendo DS game card for multiplayer play will not necessarily work together if the games are from different regions (e.g. a Japanese Nintendo DS game may not work with a North American Nintendo DS game, even though some titles, such as Mario Kart DS and Pokémon Diamond and Pearl versions are mutually compatible). With the addition of the Nintendo Wi-Fi Connection, certain games can be played over the Internet with users of a different region game. So the answer is YES ... plus Aus are rebadged UK ones anyway ...just like majority of our PS3 and Xbox360 games (except the ones who didnt make it through game censors because of our stupid M15+ gaming limitation - those ones are sent back and edited to take out certain content then resubmitted to the gaming censors) and just about everyone of the DS catridges work on the DSi
