Over at Armchair Arcade, Matt Barton has been digging into '3D Monster Maze' for the Sinclair ZX81, one of the pioneering home computer video games, and subject to an Edge Magazine 'making-of' article earlier this year.

As Barton notes: "Of all the things you might expect to find running on a ZX81 in 1981, a real time, first-person, 3D maze game would probably be somewhere near "impossible" on your list. Yet, that's exactly what Malcolm Evans was able to pull off--basically in his spare time, as little more than a diversion for himself. Nevertheless, Evans' tinkering became one of the most celebrated games for the ZX81 and a forerunner of the modern first-person game."

The piece concludes: "The game has managed to retain a huge cult following to this very day. A remake of the game can be found on the NGS website." If you want to look up the original ROM, too, Barton recommends "...an emulator called Eighty One, which worked flawlessly in XP."