UNLICENSED GAME This game is an unlicensed version of Doom (1993). Zombie Massacre (AKA Gloom 4) is a 1998 computer game for the Amiga computer. It was a clone of the immensely popular first person shooter Doom on the Amiga.Zombie Massacre's authors were proprietor of Alpha Software, Gareth Murfin, Dave Boaz, Dave Newton (coder), Frank Wille with graphics by James Caygill, Jason Jordache, Liam Weford, Slawomir Stascheck and music by William Morton (musician). The game was one of two games produced by Alpha Software for the Amiga, the other being Gloom 3, at a time when the machine was being squeezed out of the market. Source: Wikipedia, "Zombie Massacre", available under the CC-BY-SA License.