So I've recreated Tetris in Arma 3. Took me longer than expected (man, there is so many quirks in this game). I'm sure that code can be optimized (too many global variables), so if you want - feel free to add a Pull Request.
Music source: https://soundcloud.com/sanitaryum/original-tetris-theme-tetris
Game overview: https://www.youtube.com/watch?v=_HdDKYUWFPo
Steam Workshop: http://steamcommunity.com/profiles/76561198041220925/home