I was trying to help a guy out with getting his download play to work on his M3 Simply the other day and it turns out that I can't get download play on mario kart ds to work on any of the following that I tested that day: M3 Real (with latest firmware) M3 Simply (with latest firmware) which lends me to believe that it won't work on the R4 either. Isn't this a feature that they keep saying 'this fixes the download play problem' in their updates? It looks like only Bomberman works, that doesn't sound fixed. I have more testing to do but download play probably doesn't work on my supercard CF or m3 CF either. Are they fixing this feature? Pretty much i bought spare cards in case I had an issue like this come up, just put one copy of mario kart on each and then start a wifi battle.