
Resource: aliensyn
Alien Syndrome is a run and gun arcade game developed by Sega in 1987.
Two players control two soldiers named Ricky and Mary, who must fight
their way through large eight-way scrolling levels 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 move onto the next stage. As well as two player simultaneous
gameplay, Alien Syndrome features pick-ups which assist the
player including better weapons and maps of the current level.
(Wikipedia)