A thought occured for there being the possibility of Osu! being on the WiiU. This could be possible due to the already installed touch screen for easy tablet access and since Nintendo is "starting" to open up to indie developers. The only 2 downsides would be it costing money and the way to download beatmaps. But it's an interesting idea since Tank! Tank! was a free WiiU indie game, so the possibility is there. And, yes this was done on the WiiU, so don't ask. 