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. In 1988, the game was ported to the Sega Master System, MSX, Amiga, Atari ST, Amstrad CPC, Commodore 64, and Famicom/Nintendo Entertainment System . The game was also converted to polygonal graphics for the PS2 as part of the Sega Ages re-release program and included in the US version of the Sega Classics Collection . The original arcade version of the game was reviewed in the July 1987 issue of Computer and Video Games, where Clare Edgeley described it as "one of the most gripping games" she "played in months", praising the Aliens like horror atmosphere, chilling sounds, special effects, graphics and gameplay.
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