Follow these steps to create a single player course correctly:

1. Open the Level Editor;
   
2. Click in “New Campaign Course”;
   
3. Name your campaign and click in “Create;
   
4. Your new course has 8 levels, you need to place P1 and P2 starting position, 1 diamond, and at least 2 enemies in each level;
   
5. You can test your level by clicking int the play icon in the bottom-left corner
   
6. Press "P" in yout keyboard to leave the test mode
   
7. Save your level;

You can’t play this level as is, it needs to be attached to a Custom Campaign together with 4 more courses to be played.

Follow these steps to create a multiplayer course correctly:

1. Open the Level Editor;
   
2. Click in “New Multiplayer Course”;
   
3. Name your campaign and click in “Create;
   
4. Your new course has 8 levels, you need to place P1, P2, P3, and P4 starting position and at least 2 enemies in each level;
   
5. You can test your level by clicking int the play icon in the bottom-left corner
   
6. Press "P" in yout keyboard to leave the test mode
   
7. Save your level;

You can play it now in the multiplayer mode.

Follow these steps to create a custom campaigb:

1. Open the Level Editor;
   
2. Click in “New Campaign”;
   
3. Name your campaign;
   
4. Select 5 custom single player courses;
   
5. Click in “Create”;

You can play it now in the custom campaign mode.

In the options menu, select the "Misc" tab and insert the path where the Steam client downloads the files, the path will need to point to the Bulby AppId (461390) folder. On Windows, it shoul be something like this:

C:\Program Files (x86)\Steam\steamapps\workshop\content\461390

After you insert the path and confirm, the game now can automatically read the files downloaded from the Steam Workshop.