Vita acting as second screen was a thing before the WiiU. You could do it on some PS3 titles.
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Mind you, the Wii U was out for a while before the new generation came to be. And while I lack the effort to do precise research, there is another act of plagiarism. Sony Smash Bros, is the nickname I believe?
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You could do it with the os3 and psp. Poorly though.