While most Android video games are meant to be played on mobile devices, Nvidia's Shield hand-held device and Ouya's console will allow those games to be played on televisions, Ian Sherr and Don Clark write. The $99 Ouya console went on sale Tuesday and quickly sold out on Amazon's U.K. and U.S. websites. Meanwhile, the $299 Nvidia Shield portable gaming system goes on sale Thursday in GameStop stores and on Nvidia's website.

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