Homebrew on the Wii U is amazing. Can play anything on the Wii U, Wii, Gamecube, along with virtual console titles for nes, snes, n64, DS, and GBA. Easily one of the best consoles out there to hack. Not sure what poster #2 is saying as you can hack it and play from all the systems I listed above easily.
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https://rateyourmusic.com/~peekingpanda