Uploaded March 2009 | Updated September 2026, 6 hours ago

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From the description in the text file:

"Shows how much Doom marines can do even after they are dead. Dead marine: activates dozens of instant downlifts while falling down stairs; teleports behind his killer and turns around to face him again; telefrags a barrel, setting off a chain reaction; pushes a duplicate marine into a teleporter which telefrags the enemy; and kills the boss brain, finishing the level."

All credit to Lee Killough who created the test level and recorded the video.