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What was the death match mode introduced for DOOM?

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The "death match" mode introduced for DOOM was a new form of competitive gameplay devised by John Romero.12

Designed to take advantage of the game's fast peer-to-peer networking, this mode allowed players to engage in rapid, violent, and competitive player-versus-player combat within the game's virtual environments. By establishing this style of play, DOOM helped solidify competitive multiplayer gaming as a critical and defining element of future personal computer titles.12