DESC: In this version of Tetris, you have Tetrads made up of four blocks, but this time they can also be connected diagonally. The aim is not to set up rows, but to eliminate the flashing blocks on screen by linking up similar colours in lines of three. Eliminate all of the flashing blocks to clear the stage and move on to a harder stage. You can set block speed and the number of flashing blocks on screen before each round.