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Alien Syndrome is a cooperative, top-down, run & gun shooter with aliens developed by SEGA as an arcade game in 1987.
In the game the characters Ricky and Mary have to blast their way through scores of vicious aliens, release all the captives and reach the escape hatch before the time bomb explodes in 6 large levels. After succeeding in getting to the escape hatch, the player will suddenly get attacked by a terrifying end boss.