Shareware corridors bring first-person shooting to ordinary computers
id Software's shareware release used a fast ray-casting engine to put players inside texture-mapped corridors on ordinary computers. Giving the first episode away and selling the rest by mail proved shareware could fund serious development.
Shareware release; the first episode was given away and the remainder sold by mail order
Entry 76 of 164 in the record
What happened
Drawing a three-dimensional space without dedicated graphics hardware meant cheating intelligently. John Carmack's engine treated the world as a flat grid of walls, cast a ray for each column of the screen and scaled a texture to fit, producing a convincing corridor at a frame rate nothing else on a desktop machine could match. Rooms could not slope, stack or vary in height, and nobody minded. Movement was quick, the walls had detail, and the player was plainly inside the picture instead of watching it.
Distribution was as unusual as the engine. Apogee had built a business on releasing part of a game free and charging for the rest, and here the free part was good enough to spread on its own through bulletin boards, university file servers and passed-around floppy disks. Registrations arrived by mail, sometimes in volumes the small company struggled to process. Publishers, retailers and shelf space turned out to be optional, which was a genuinely new proposition for a commercial game.
Content made it notorious as well as popular. Players shot their way through a Nazi stronghold, and the imagery was strong enough that the game was later restricted in Germany and altered for a console conversion. Within the industry, though, the lasting effect was structural. A very small team with no publisher had produced one of the year's most discussed products, and the studio's next release would take exactly the same approach considerably further.
The world at the time
MS-DOS machines in 1992 had no standard graphics acceleration and often no sound card, so performance came from programming rather than hardware. Retail computer games sold in boxes through specialist stores, with publishers controlling access to the shelves. Shareware was regarded as a hobbyist channel suited to utilities and small puzzle games, not to anything ambitious.
Historical significance
Two things arrived together: a viewpoint that made the player occupy the space, and a distribution model that let a tiny studio reach a mass audience without a publisher. Both became foundations of the personal computer game business, and the first-person shooter grew into one of the medium's dominant forms.
What it changed
The studio's next game refined nearly every element and became a cultural event. Shareware, and the download storefronts that succeeded it, gave independent developers a route to buyers that eventually became the industry's default. Later engines replaced the grid with real geometry, but the control scheme, level pacing and weapon progression set out here persisted.
Sources consulted
- Masters of Doom
- Replay: The History of Video Games
- The Ultimate History of Video Games
Listed sources support the facts in this entry. Wording throughout is original to this archive. Read more about how entries are researched in sources and methodology.
Last reviewed September 2, 2026. Report a correction