Developed for the Sinclair ZX81 twenty-five years ago, 3D Monster Maze occupies a tender spot in European gamers' hearts; consisting of a maze rendered in contemporary 3D and complete with a monster, it truly lived up to its title. As the first 3D title for a home computer, and the first corridor-based horror game, 3DMM is considered by some to be the first FPS, a precursor to the likes of Doom -- technically the game features no shooting, but there are similar elements.

However, it wasn't developed as a game at all, as this behind-the-scenes look by Edge reveals. Originally a learning exercise, the frightening T-Rex only came to life after a casual suggestion, and the game's air of horror and suspense developed from there. This story really brings to life the days of bedroom coders and the times when a game could change on the creator's whim, although anyone who remembers the cold sweat induced by the words "HE HAS SEEN YOU" is probably quite glad they're over.

This article was originally published on Joystiq.

Commence rampant PSP part deux speculation!