When I was on my previous connection, I had to have a wired connection. My Internet wouldn't connect to Splatoon for anything. It would throw me off almost every match and the lag would be horrendous, so getting a wired connection was the only option. Now that I have a different connection and it's much better Internet, I'm back to wireless. I can stay connected without an issue and don't experience much lag, and I prefer the wireless connection overall since the Wii U ends up being more mobile. I can take it into my room now when I need to. x3