How to play the Proving Ground in Multiplayer

Step #1: Open the game’s Local Files

Open Steam, click Library, right click Spintires Mudrunner in the list on the left and click Properties. This will pull up a window with tabs at the top. Click on the Local Files tab, then click Browse Local Files at the top of that list.
File Explorer will pop up with the Spintires Mudrunner folder opened.

Step #2: Navigate to the Levels Folder

Once you have the Spintires Mudrunner folder open, double click on Media.zip (or .rar compressed/zipped folder). Then double click on levels. You are now in the levels folder. In the levels folder should be a bunch of .DDS and .STG files.

Step #3: Copy and Rename the game_proving .DDS and .STG Files

In the levels folder, find game_proving.dds and game_proving.stg (they should be right next to each other). When you’ve found those files, highlight both and copy them to your desktop where you can rename them. Once you’ve pasted them to your desktop, again highlight both, right click on them, and then click Rename. When the file names become highlighted blue, type level_proving_ground (if only one of them gets highlighted blue, when you type the new name it does it for both anyway).

Step #4: Insert the Renamed Files Back Into the Levels Folder

Highlight the renamed files and move them right back to the levels folder.

In-Game Stuff

Unfortunately, the game removed the Dev Tools because we renamed the files level instead of leaving it game But thats how it makes it be able to have multiplayer. But yeah guys thats how to play the proving ground in MP! See ya…