The only reason they didn't do anything online related is because the Wii U they hacked isn't connect to the Internet to maintain possible exploits and homebrew instead of taking the risks of having a patched/ updated system. Nintendo honestly never even used an anti-cheat system in any of their games and I'm 99% sure they again relied on their console's security only. If they catch you play extremely obvious with hacks they'll probably just ban you (like on Wii). It was 3rd parties messing with RAM hackers in the past and mainly for offline games though, lmfao.Relys is correct there appears to be no offline "ANTI-cheating system". But no one really cares if you cheat yourself or cheat your friends and/or family. BUT online is easily detactable that's one of the reasons none of their ghost data has been uploaded.