10. Tetris
Total sales: 170 million units
There is hardly any man in the world who have not heard a word ‘tetris’ at least once in a lifetime. It is scientifically estimated that playing this gripping video game increases the memory capacity and also improves attention span. It is also beneficial in reducing the manifestations of negative flashbacks and post-traumatic stress disorder (PTSD) as well. There is a study conducted in Plymouth University claiming that playing Tetris can help you ‘lose weight, cut back on drinking, or quit smoking’. You can find this game on Guinness World Records list as the most ported game (it appears on 65 different platforms).
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