Game FAQ

Find the answers to some of the most common questions and problems here.

Multiplayer

Make sure you are online
Make sure you've invited at least one player
Try hosting with both normal and legacy hosting mode
Disable firewall
Make sure all the players have the same game version.
Make sure that if you are playing a workshop map, all the players have it installed (just click Subscribe in the Workshop)
Try restarting your PC

Make sure you're online and connected to Steam
Check if Steam servers are down
Verify game files on Steam (right click the game in the Steam library > Properties > Local files > Verify...)

Simulates a low performance device.

Gives you all the small optimizations across the game:

Removes particles when interacting with specific objects (like on The Top with rotating spheres or thunder in Brain Checkup)
Decreasing the detail level of Water system on the level if there is one
Replacing some high-detail objects with low-detail version of them (like a toy house on The Attic)
Removes some objects from the level that can cause bad performance
Bigger thresholds when calculating should an object be moved in coop syncing.
Enabled distance-based occlusion on custom levels. The level will have object popping.

Note: If you're in-game and toggle this option, you'll need to restart the level to see the changes take effect.