So the MAU is above the sold of GTAV, massive.
How much for it to pass all sold variations of Tetris?
Hard to say exactly how much Tetris has sold with how old it is and how many times it has been re-released. The mobile release by EA has sold 100 million units. With the limited known sales for Tetris we have the Series with 171 million units sold. https://www.vgchartz.com/game/226237/tetris/