Tetrion
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The tetrion is the frame that surrounds the playfield. Henk Rogers has defined "tetrion" as the machine that plays Tetris.[1]
Different tetrions may implement different variations of the game rules. For example, TAP indicates the game mode with different frame colors:
 Master |
 Normal |
 T.A. Death |
 TGM+ |
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.