I'm playing it on an R4. No connection problems. Have you successfully connected in other games? Or is this your first time trying? Either way, if you post your router/security set-up someone may be able to help you out.I'm trying to get a few more friends to buy this to co-op play but it hasn't appeared locally here in stores yet. Are you guys running the game on your flashcards? I can't seem to connect to Nintendo Wifi with my R4. It tells me there was an error connecting.