How to make a Guest Difficulty (GD):
- The GDer has to download the map, then use the editor to make their own difficulty.
- After the difficulty has been made they need to send it to the owner of the map.
- The owner of the map will then include the GD in their map and update the set via the editor.
- Afterwards the Owner will assign the GD ownership on the website (screenshot), this is done via the "discussion" panel of the set.
In case of a collab, multiple owners can be assigned to a difficulty.
In case you meant to ask"how do I get people to make a GD for my map" or "where can I find maps to make a GD for":
Beatmap Projects:
community/forums/53This is the place where mappers post their sets so that others can join.
Here you can post your own set, or join someone elses set.
Modding Queues:
community/forums/60As the name suggests, the main focus here is modding, but even still, there are queues that allow for GD requests.
So if you're looking to get a GD for your map, this would be the place where you can make requests to queue owners directly.
Just keep in mind the queues rules, not every queue is open for requests/some even have their own preferences too.