Labs_underpass_p.upk Official

Disclaimer: Modding Rocket League is done at your own risk. Always backup your files. Map files & packages - RL Modding Wiki

When using Park_P instead of Underpass, forgetting to rename the file back can cause you to get a 15-min ban if you join a competitive playlist and Beckwith Park appears. Using Underpass reduces this risk.

Take the custom .upk file you downloaded and rename it exactly: Labs_Underpass_P.upk . Labs_Underpass_P.upk

You don’t need to swap files between playing online and playing offline.

This method is primarily for local play and Freeplay. Disclaimer: Modding Rocket League is done at your own risk

Create a backup of the original Labs_Underpass_P.upk to avoid losing the default map.

Move your renamed custom map into the mods folder. Using Underpass reduces this risk

For easier management, consider using the Rocket League Map Manager on GitHub to switch between custom maps automatically.