The karma system
This is an automatic system to rate the proper (or unproper) behavior of players.
A new player starts at 50 karma points. The maximum score is 100. When you finish a game successfully, you earn 1 Karma point. If you are the first player to quit a game on purpose (ie: to quit without resuming), you lose 5 points as a punishment.
Dots divide Karma into 5 levels:
You may specify a minimum level of Karma when creating a new game.
Note that you cannot ask for a Karma level that would be higher than your own level.