Assertion: doom | /r/HasProperty | the use of a monorail system
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text: Doom 3 is notably inspired by the 1998 game Half-Life this is seen apparent in the focusing of teleporters in the games, an elite military presence in both (HECU/Black Ops in Half-Life and Marines in Doom 3), the use of a monorail system, and the scientists prior knowledge and research of the major non-human faction (Xen in Half-Life's case, and Hell in Doom's case).