Free Tetris game of very good bill and HTML5, ie it is compatible with all recent browsers, even those that do not support flash like Chrome. This game is also playable on Mac. The principle is simple, bricks of different shapes fall and with the arrows of the keyboard you can turn them, move them see them go down faster. The goal is to create lines without holes so that they fade and report points. A very addictive game and great when you have 10 minutes to lose.