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

Create a backup of the original Labs_Underpass_P.upk to avoid losing the default map. You don’t need to swap files between playing

No, you can ignore the universal Mods.upk file for this method. Labs_Underpass_P.upk

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

This blog post guide helps Rocket League players navigate the complexities of using custom maps via the Labs_Underpass_P.upk method.