Tetrion

The tetrion is the frame that surrounds the playfield. Henk Rogers has defined "tetrion" as the machine that plays Tetris.

Different tetrions may implement different variations of the game rules. For example, TAP indicates the game mode with different frame colors:

Similar to TAP, TGM3 uses differently colored tetrions for each game mode:
 * Easy: Green
 * Sakura: Pink
 * Master: Blue
 * Shirase: Red

In Tetris Worlds, tetrions are described as gateways which, when opened, give the Minos access to a new planet in their galaxy suitable for terraforming.