Labs_underpass_p.upk Link

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

Have you ever wanted to play custom Rocket League workshop maps but felt lost with the file management? The most effective way to play custom maps on PC is by utilizing the map as a base. Labs_Underpass_P.upk

It is considered one of the best methods to load custom maps on PC. How to Set Up Custom Maps (Step-by-Step) 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. Labs_Underpass_P.upk