No Artificial Colors

From Traxus

No Artificial Colors is a level in the first Marathon.

Vidmastery

The level's design appears to require the player to shoot a switch in order to proceed, which would make it impossible to vid the level without expending ammo. However, it could be possible to bypass this obstruction by luring a Trooper into firing a grenade to launch the player through a window into the room with the switch, allowing the player to get through the level without expending ammunition. As of 2008, no known film exists of this technique being used.