As you can expect, the difficulty level is high, like many platformers/shooters of the 90s.
A lot of cutscenes help create the atmosphere. The graphics are excellent, with big sprites and a well-designed environment. Ripley is armed with a big gun and has to fight tons of aliens, explore the levels and try to save hostages. But once the game starts, you will notice it is pretty different from the movie. The monsters killed everybody (apart from Ripley, of course) and forced the vessel to land in Fiorina 161, a prison planet. The game's plot starts precisely like the movie, with Ripley waking up from the cryosleep and realizing that two aliens had entered the ship before the takeoff. A reduced version was also released for the Commodore 64, while the SNES version is an entirely different edition. The game was developed by Probe Software originally for the Mega Drive / Genesis console, but it was converted to Amiga, Master System, and Game Gear. Alien³, or more simply Alien 3, is the videogame based on the sci-fi horror movie with the same name, the third of the series.