Blasto is a 1978 game by Gremlin Industries for Blockade hardware. You play as a spaceship and have a limited time (presumably set by the operator) to clear a board full of mines. There is only one button, which shoots. If a mine explodes, its explosion can take out nearby mines, but also hit you, sending you back to the …

Comotion is a 4-player upgrade (of sorts; whether or not it was an upgrade board or a separate product is unknown) to Gremlin Industries's 1976 arcade game Blockade released the same year. It ran on the Blockade hardware. One credit plays in two-player mode; two plays in four-player mode, and the "heads" of the other two players are still on …