Tetris couldn’t have been designed with more serendipity. Not only did creator Alexey Pajitnov put together the most instantly recognisable and enormously popular puzzle game, but he designed it in the shape of a mobile phone. Now that’s foresight. And while the game is currently selling in its millions of squillions for the handheld market, it’s still reinventing itself for the PC. Tetris Friends is a free, online collection of popular Tetris game types (Marathon, Sprint, Ultra, Tetris 1989, Survival and n-blox, along with sponsored promo versions, currently plugging Ice Age 3). There’s also multiplayer modes, with two and six-player Battle mode, and five-player Sprint game. A few videos have appeared pushing the multiplayer games, which are below.