I would say they have managed to find a string within the system.xml file for the wiiu and changed it so you can now have games like Splatoon on your gamepad screen working, if this is the case then all games playing this way should all work. I would of thought a little mod change in a file similar to changing the string in your ds vc title/meta.xml file to get cbhc working on your tv, not just your gamepad screen. Another problem I was thinking is, if this is the method they have used to get the games working on your gamepad screen then without a doubt it could get very complicated for members that are not very tech savvy to get the string changed and uploaded too the wiiu for it too work also bricks may happen in the process! I'm not trying to scare anyone or put anybody off doing this mod, its just I think this is what will be needed to get the end result.

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