Health Expert Tutor : Tetris in 446 Bytes

You want to play Tetris. You want to play Tetris on any operating system. You want to play on an old IBM PC, you want to play Tetris on a new MacBook. You want a Tetris that’ll fit inside the master boot record of a disk. You want Tetris as an operating system. You want TetrOS.

Or maybe you don’t, but it’s a fantastic piece of work, and we love tiny demos. Check it out below the break. Or read through the source code in the banner image.

It doesn’t have scores, or fancy graphics, or an intro splash screen. It doesn’t show the next brick. It doesn’t speed up as you keep playing. The fatal flaw is that it doesn’t play the Tetris theme in the background. But it is tiny, and it is playable.

And speaking of Tetris without an OS, if you’ve got a comparatively spacious Arduino, you can get a version with all the frills.