Mars Matrix is a top-down vertical scrolling shoot-em-up (shmup) game, originally for the Capcom CPS-2 arcade board. It is the second in a series of three Capcom/Takumi shmups, between Giga Wing and Giga Wing 2. Mars Matrix features unique gameplay based on the "mosquito" system. By holding down the fire button, your ship can absorb shots and then "spit' them back at the enemies. (mobygmes.com)