Networked Deathmatch

Machines exchange state across a shared network. Early implementations were peer-to-peer, with every copy simulating the world and broadcasting positions and events, which only works when the network is fast, local and trusted. Rules were minimal: a level, weapons distributed across it, respawns, and a running count of kills. Nearly everything competitive shooters do today descends from that small set of arrangements.

id Software added networked play to Doom in 1993, and the word deathmatch comes from that team. Precedent exists and is worth naming: networked competitive games ran on mainframes and university systems through the 1970s, including maze shooters played between terminals. What Doom supplied was reach, because it ran on ordinary office hardware that companies had already bought for entirely different reasons.

Competitive personal-computer gaming effectively begins here, along with mods, custom levels and a considerable body of corporate network policy written specifically to stop it. Limits proved as instructive as capabilities: local networks are trusted and low-latency, so nothing in the design anticipated cheating, lag compensation or strangers, and the following decade of engineering went into making the same experience survive the public internet.