Skulls in Halo: CE act like modifiers that impact your game. You can choose to turn them on for a greater challenge or to make things a little easier. They can impact the game in various ways to make it more fun to play. Previously, skulls needed to be collected from specific locations in the game, but now you can activate them all from the main menu in the Master Chief Collection.
To activate skulls in Halo: CE, click on the mission you want to play in the missions menu, then click on the skulls tab. From there, you can click on each skull to activate it and then click on Accept Skulls to confirm your choices. All the skulls will have various modifiers, and score multipliers, attached to them.
All Skulls and their modifiers
Skulls are broken into two groups, Scoring and Non-Scoring.
