Custom Game Worlds are bought and created by members of the Soccer Manager community. The creator can decide on the format and also the rules for this Game World.
Once you have purchased a Custom Game World via Upgrades, you can create it from going to My Game Worlds and then clicking on Create Game World. You will then need to follow the 5 on screen steps prior to the creation of your Custom Game World.
The 5 steps in the creation of a Custom Game World:
When creating your Custom Game World following the five on screen steps you can choose any of the following unique features:
Once the Game World has been created you then administrate it deciding which managers you want to let join and adjust the Advanced Rules if necessary at the start of each new season. However, once it has been created you cannot delete or restart it or swap any club for another one and you cannot change it's name as this is unique within the game.