Labs_underpass_p.upk Official

Open the game, select "Freeplay" (or local match) and choose "Underpass". Your custom map will now load. Pro Tips for Map Modding

Labs_Underpass_P.upk is the underlying file for the "Underpass" Rocket League map. By replacing this specific file with a custom map file and naming it properly, you trick the game into loading your custom map instead of the standard Underpass, allowing you to play workshop maps in Freeplay. Why Use the Underpass Method? Labs_Underpass_P.upk

You don’t need to swap files between playing online and playing offline. Open the game, select "Freeplay" (or local match)

It is considered one of the best methods to load custom maps on PC. How to Set Up Custom Maps (Step-by-Step) By replacing this specific file with a custom

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.