Tetris is popular because it has been proven to reduce stress and enhance brain power. The most notable was a UK study showed Tetris helped people that were victims of trauma reduce flashbacks.

As a documentary-article clearly points out, today's video games spend millions and must use violence and marketing to achieve even a percentage of what Tetris has accomplished.

It's amazing how many people playing now. Must see, http://tinyurl.com/r97xna