Buying & Platforms · Source-led
Moon Sweepers Alt-Tab Problems: Identify and Troubleshoot
Quick answer
There is no official statement that Moon Sweepers pauses when the window loses focus. One launch-week player complained that the truck kept moving after alt-tab, while 1.0.4 confirms J.O.O.N.A.S. keeps cleaning when no player is nearby. Those are different behaviors. Test on a disposable save before leaving a long run unattended.
Symptom
Identify the actual symptom
| Symptom | What it suggests | First check |
|---|---|---|
| The game keeps running while another window is active. | The process did not lose focus or does not pause on focus loss. | Watch a clock and a robot for two minutes. |
| The screen goes black or freezes. | Display-mode or GPU issue. | Switch to borderless/windowed and update the driver. |
| The game crashes. | Driver, overlay or a launch-option conflict. | Remove the -force-d3d12 launch option; verify files. |
| Audio continues but the picture stops. | Rendering or focus issue. | Check the display mode and GPU load. |
| Audio stops but the game is still running. | Background audio or focus policy. | Check the game and Windows audio settings. |
| The game pauses until you return. | A pause-on-focus-loss behavior may exist. | Confirm with a stopwatch and a robot state. |
Do not merge these into one “alt-tab bug.” A crash, a paused process and a background factory are different outcomes with different fixes.
Evidence
What the current evidence supports
The 1.0.4 patch says J.O.O.N.A.S. keeps cleaning even when no players are nearby. That is a distance rule, not a focus rule. A player leaving the area and a player alt-tabbing are not the same condition. A separate player report says the truck should stop when alt-tabbing, implying it continued for that player. Single reports cannot establish universal behavior.
The checked official pages do not document a pause menu behavior for focus loss, a dedicated pause key or an idle mode. This guide cannot tell you that the game always pauses or always continues.
Test
Run a safe test
- 01
Back up the save
Copy the current save slot and its backup folder. The game keeps five backups per slot, but a manual copy separates a test from a long-running world.
- 02
Start a controlled state
Load a test world, note the wallet, a machine's input level and whether a robot is moving. Stay in a safe place with no irreversible action pending.
- 03
Switch away for two minutes
Use Alt-Tab, not a minimized full-screen overlay. Start a stopwatch and do not touch the game.
- 04
Return and compare
Check the wallet, the machine, the robot position and the game clock. A change means the process continued; no change may mean a pause or a lack of work, so repeat once with a known active robot.
- 05
Record the result
Write down the game version, Windows version, display mode and GPU. A result from someone else's PC is not a substitute for your own test.
Fixes
Reversible checks for a crash or black screen
- Remove
-force-d3d12from Steam launch options. Patch 1.0.4 made DirectX 11 the default on AMD to avoid crashes. - Try borderless or windowed mode if full-screen alt-tab loses the display.
- Update the GPU driver and close overlays that hook the game.
- Verify the Steam files after a crash; the game has save repair, but a damaged install still needs repair.
- Keep a local save backup before changing display or launch settings.
- Do not disable security software to fix an alt-tab symptom without a specific, verified cause.
Straight answers
Questions about this task
Does Moon Sweepers pause when I alt-tab?
No official pause-on-focus-loss rule was found. Test it on a backed-up save; do not assume a long run is paused.
Does the factory keep running in the background?
The 1.0.4 patch says J.O.O.N.A.S. keeps cleaning when no players are nearby, which is not the same as alt-tab. A player report suggests a truck continued after alt-tab, but it is a single report.
What should I try if alt-tab crashes the game?
Remove the -force-d3d12 launch option, try borderless/windowed, update the GPU driver, close overlays and verify the Steam files. Back up the save first.
Trace the answer
Sources and scope
This is an independent, source-led guide, not a first-hand playtest. Gameplay values, build-menu details and UI behavior are checked against the 1.0.4 data snapshot and official patch notes. Your installed build is the final authority.
- Official Moon Sweepers 1.0.4 patch notes Official patch notes, 25 Oct 2026.
- Reference Wikily: Controls Moon Sweepers 1.0.4 data index, checked 28 Oct 2026. Useful for build-menu values; not an official developer page.
- Community Steam discussion: late game A player asks for the truck to stop when alt-tabbing, 26 Oct 2026.