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Blood river in E4M5: They Will Repent.


Blood splatter in MAP17: Tenements.

Blood is ubiquitous in the Doom games and in other games based on the Doom engine (including Heretic, Hexen, Strife, etc.), and is perhaps a large factor in making them controversial in some circles (and appealing in others).

In many levels, blood flows in rivers, over blood-falls, and gathers into pools. In Doom, standing in or moving through blood is often detrimental to a player's health (see damaging floor).

The Doom engine creates animated blood spatter when a shootable thing is hit (including the player). Besides enhancing the atmosphere of the game, this helps the player to know that his aim was correct. Blood also splatters when things are crushed. In both cases, Vanilla Doom treats blood as a transient special effect; only the source ports (initially Doom Legacy but later ZDoom) allow for monster blood to splatter onto walls, and stick there.

For realism, hitting inanimate objects, including Doom's Barrels, produces a puff of smoke rather than a blood splatter, however, if a barrel is crushed, it will leave behind a pool of blood.

In Doom, furthermore, as a player's health drops, the status bar face becomes progressively bloodier. All the manuals state that the status bar face begins to look more like raw hamburger.

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