When playing Halo 3's Campaign with Campaign Scoring turned on, progress is measured in points, which are earned by killing enemies. Different enemies give different points, and bonuses are provided in the form of medals. Betrayals and deaths deduct points. Having Gold Skulls activated will multiply the player's points, as well playing on higher difficulties or finishing the level quickly. Using the "Save and Quit" feature allows the player to continue the game from the last checkpoint, but it also turns off Campaign Scoring and discards all points the player has earned in that session.