How to Mod Unity Games

 The first steps of modding.

Modding a Unity game takes some experience, but with this guide you should be successful in the process. First, you need to identify if the game you have is a Unity game. If it has anything titled “UnityCrashHandler64” or a folder titled “game name_Data” (where the executable matches the game name), then it is a Unity game. If not, the game will not work for these mods. 

Getting the essentials. 

Most Unity games recognize a plugin called BepInEx, which is a folder to put your mods in. To start, drag the BepInEx folder into the game’s main folder—do not put it in the game’s _Data folder. Then check inside BepInEx to make sure it contains cache, core, plugins, config, and patchers. If any are missing, create them. 

Next, find a mod to install. Go to modding websites like Thunderstore or GitHub. For example, the ULTRAKILL multiplayer mod “Jacket” can be found by searching “Jacket” on Thunderstore or looking for an “Ultrakill multiplayer mod” GitHub link. Download the mod and any dependencies it requires. If the mod is for an older version of the game, you will need that version installed. 

 Installing the mods properly. 

Once you have the mod files, unzip them so each mod has its own folder containing a DLL file (unzipping to your desktop is recommended). Drag all mod folders into the plugins folder in BepInEx and double-check that they are correctly placed. 

Playing and experiencing the mod. 

Start the game. The mods should appear as described in their documentation, sometimes in the options menu (like “Plugin Configurator”) or directly in gameplay. If they do not, check the game version or ensure the game is reading the correct folder. 

Getting the right version and fixing the game. 

If the mods still don’t work, verify your game version. Steam users can use SteamDB to download the version needed. After installing the correct version, redo the installation steps. If it still fails, the game may be referencing another folder. Locate the correct game directory, ensure folder names match, and replace the old version. You may also need to turn off updates or verify the game in Steam’s properties menu. 

Once installed correctly, the mods should function as intended, opening new ways to experience your favorite Unity games.