Running a cup
Open a listing, take signups, lock the field, and type the placements.
Organizers and captains
Any signed-in player with a finished profile can host a cup. The format you pick — single elimination, double elimination, round robin, or Swiss — is a label for humans. This version does not build the bracket, seed it, or open a check-in window.
Only a captain can enter or withdraw a team, and only while signups are open. The organizer then locks the field.
Results are typed
After lock, the organizer records a placement for each team that entered. Placements cannot collide, and a team cannot be placed twice. Marking the cup complete requires at least one placement.
Prizes, lobby settings, and screenshot checks stay outside Arena. Write anything unusual in the rules field so captains see it before they enter.