What a perfect time for Nintendo to re-release Tetris: Axis on the 3DS eShop for just $10! Believe it or not, Researchers at McGill University and the Research Institute of the McGill University Health Center have found that playing Tetris helps adults that suffer from lazy eye issues. The puzzle game helps the patients use both eyes together, making for an intense focus while clearing lines. As long as you're playing Tetris, your parents can't tell you you'll go blind from playing too many video games!