“Alien Syndrome is a run and gun game developed by Sega and released in arcades in 1987.
In Japan, Game Machine listed Alien Syndrome on their May 15, 1987 issue as being the third most-successful table arcade unit of the month
Two players control two soldiers, named Ricky and Mary, who fight their way through large eight-way scrolling levels while rescuing their comrades who are being held by aliens. After they have rescued a certain number of hostages, the exit opens and they can pass through it in order to fight the end-of-level guardian. If this monstrosity is defeated, they are then able to move onto the next stage.”