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Comotion is a 4-player upgrade (of sorts; whether or not it was an upgrade board or a separate product is unknown) to Sega/Gremlin's 1976 game Blockade released the same year. One credit plays in two-player mode; two plays in four-player mode, and the "heads" of the other two players are still on the board (and hazardous!) even in two-player mode. Each round continues with players who crash being eliminated until one player is left, and the number of lives players have left is shown at their starting side of the screen. Otherwise, the game plays the same.