A Glow Worm is a portable worm with a bioluminescence effect that is only activated when shaken. It is first found inside the Gravity Tether Core, sitting on top of a crate. Once shaken (literally by shaking the controller), it will glow, providing a weak, acid-green light.
- While it is mandatory to pick up the Glow Worm, it is not required to actually use it. The Glow Worm provides minimal lighting, and is not necessary to complete any section of the game.
- Every playable character after Sam Caldwell already carries a Glow Worm, despite never picking one up. It is currently unexplained as to why they would have a need to be carrying these, or why no one uses flashlights.
- Glow worms are, in reality, the flightless female form of fireflies. It is possible that they were genetically modified to glow very brightly and not move, for use as organic lanterns.