The Turbo button worked wonders for Tetris. You start it with turbo turned on, so Tetris adjusts to the computer’s speed - but it only does this once, at startu

The Turbo button worked wonders for Tetris. You start it with turbo turned on, so Tetris adjusts to the computer’s speed - but it only does this once, at startup. As soon as the blocks start falling, you turn the turbo off, and now your Tetris runs at half speed. I even managed, a few times, to roll over a score of 32,768 (ah, those signed integers).