Ladder League - Random Doubles

Players are grouped onto courts, then play a full round robin with the other players on that court.

This can be run as part of a multi-week ladder league, or as a standalone session often titled Round Robin Royale.
Players remain on the same court for the whole session and essentially play with every other player on their court once.
Games are not timed; each court manages its own games.
Games are usually played to 15, win by 1, with 5 players on a court; to 12, win by 1, with 6 players; or to 10, win by 1, with 4 players.
Because each court is a smaller group, players are generally much closer in playing level, making this format well suited to highly competitive games.
PIRAT ratings are generally used to determine which court a player ends up on, except in multi-session ladder leagues where ladder position or division may be used instead.