Action / BROWSER GAME

Underrun

Fight through a dark 3D facility and reboot its failed systems.

YOUR GAME IS READY TO OPEN

Underrun

Ad-free game. Files load when you press play.

Desktop keyboard and mouse required.

Press play to start

SELF-HOSTED · AD-FREE

Ad-free, self-hosted MIT-licensed game. Desktop keyboard and mouse with WebGL. Three compact facility stages; progress is a single run, not an idle save. Contains stylized sci-fi combat and flashing effects.

MIT license · Audio library notices · Original source ↗

keyboard controls listedmouse controls listed
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PLAYER GUIDE

How to play Underrun

Underrun sends you into a dark facility to restore failed computer systems. Movement and aim are independent: keep moving while firing at robotic enemies, then find the computers needed to continue.

  1. Wait for the opening terminal sequence, then click to deploy.
  2. Use WASD or arrow keys to move and the mouse to aim and fire.
  3. Explore the connected rooms and approach the active blue computers to reboot them.
  4. Restore every system in the area to move to the next stage. Watch the health indicators and collect health pickups.

A few useful tips

  • Keep moving while you shoot; standing still makes it easier to be surrounded.
  • Use the room layout to approach enemies from a direction with room to retreat.

If something isn’t working

Use a desktop browser with WebGL. Click the player to enable audio and input. Retry reloads the run. This compact game uses intentionally low-resolution graphics and dark lighting.

Controls are catalog references; check the in-game instructions. Device support and browser builds can differ. Our testing standards · Updated October 31, 2026.

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