Doom (ZX Spectrum)

Doom for the ZX Spectrum was an unauthorized fan game version of Doom for the  home computer system running the  operating system. It was developed by Spectrum programmers Sauron and RPSG of the Russian Digital Reality demo team. An early demo was included as a covertape feature in a 1997 issue of ZX Files Megatape 1. A more fleshed-out pre-release version 1.5 was also made available later. A final complete version of the game was never released, however.

Features
The game engine consists of a Wolfenstein 3D-like raycasted point of view in a small window with a colorful border, running in the ZX Spectrum's basic 256x192 attribute video mode. The gameplay portion of the window is monochrome, due to the Spectrum's limited color display capabilities. Game content is entirely custom, though heavily inspired by the official Doom artwork. The game is controllable via the keyboard.