These scores are used for selecting different levels of difficulty levels for Brutal+ games.
Most mutators also have a certain difficulty score associated with them, called an 'Abomination Value'. For more numeric data on mutators (as well as mutator information for other difficulty levels), please visit Maguro's Blog. Click the 'Details' button to display more information on each mutator.
Names, icons, descriptions and mechanics of these mutators are listed. A list of all of Starcraft II Co-op mutators is shown below.