Labs_underpass_p.upk

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

This guide will walk you through setting up, testing, and managing custom maps using the Labs_Underpass_P.upk file method. What is Labs_Underpass_P.upk? Labs_Underpass_P.upk

This method is primarily for local play and Freeplay. You don’t need to swap files between playing

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 can directly create or import meshes and textures inside your level package.

Ensure the map you are using is up to date and correctly renamed.