Rheolism

Rheolism is a Tetris variant written in one line of BBC Basic code. It can run on BBC Micro computers and the Acorn Archimedes.

Despite the minimal code, the game still contains many of the standard Tetris features: blocks can be rotated counterclockwise, bricks can be moved left and right, there are sound effects and the ability to pause, and two-player competitive and cooperative modes are available.

There are also multiple bugs, including one where the game freezes if you hold down a key, and the game will crash after 136 years of play.