There's much to be said of that "in-the-zone" feeling that rushes over you as you obliterate line after neon line of digital blocks. Even if you don't remember it consciously, you played Tetris at least once in your life. Seriously, the game's everywhere. There is no way you could have missed it. Unless, you were raised in some weird M. Night Shyamalan situation. Fear not, because Tetris Battle on Facebook takes the iconic Russian puzzler, throws in a blazing multiplayer component, and brings all your friends into the world of furious fingers, vibrantly colored blocks and intense cerebral battles. In case you just now pinched yourself: Tetris is on Facebook, and it's just as addictive and gripping 25 years later.