QtMutatris is a puzzle game similar to tetris/columns. You will start with a blank grid and a single block made up of 4 sub blocks. It will either be either a horizontal, vertical line or a rectangle. Press the up arrow to change the order of the sub-blocks. Line up blocks of the same type. As time progresses the block will move down, or you can swipe it down, or press the left/right arrow keys to move the blocks. As you progress your level will change and so will the difficulty.
OS X 10.7 or later