In your Steam library, click on Wrack and then 'browse the workshop' for a mod that interests you. Simply click subscribe and the mod will download the next time you start Wrack. Downloaded files are located in your userdata folder. The default location is Steam\userdata\user #\253610\remote\workshop

For mods not on Steam, files should be either in .wpk, .zip, or .map format to be usable in Wrack. If the mod is a zip file, be sure that you don't need to unzip it first to use it. Save the files anywhere you wish, as long as you have a shortcut to Wrack located in the same directory.

To load mods you have subscribed to, you need to browse to the workshop content menu. From the main menu, click on New Game, then on Workshop Content. Depending on what you downloaded, the mod you are looking for can be located in either Subscribed Maps or Subscribed Mods.

Subscribed Maps include no custom content, so multiple maps can be loaded at a time into Wrack without any issues. To load one simply select the map you want, then select your difficulty. If a map is out of date (wrong format), it will fail to load and display an error.

Subscribed Mods are loaded one at a time within Wrack, but more can be manually added (see the next section for more). To load a mod, simply click on the one you want to apply it as the current mod. If the mod wasn't already loaded when you started Wrack, it will ask you if you want to restart to apply the changes. If you want to load the mod now, click yes to restart Wrack. After Wrack restarts, the mod should be applied. To check if it loaded properly, check to see that the time attack, score attack, and gallery mode menus are greyed out and unselectable.

Loading mods will also disable certain achievments. If the current mod has an error that causes Wrack to crash, you will be asked if you want to unload the mod. You can also manually unload a mod in the Subscribed Mods menu.

Loading subscribed mods is simple, but you can only load one at a time using that method. To manually load more mods, you need to drag and drop the mods you want on to the executable file (or a shortcut to the executable). Hold ctrl if you want to select more than one at a time. Mods must be either in zip format or wpk format.

If you have a subscribed mod loaded at the time, it will be loaded alongside the other mods you added. The above method can be used for the Steam version of Wrack as well as any of the other versions.

Please note that not all mods are compatible with each other. Some errors may crop up that require manual fixing.