Like the other games in the franchise, Halo Infinite's campaign offers a few different levels of difficulty; easy, normal, heroic, and legendary. Completing the campaign on legendary is a complicated task, one which becomes even more challenging when players equip all 12 skulls available in Halo Infinite. The reward for completing the game in legendary with all skulls on (LASO) is the rare achievement, "Headmaster," a coveted prize.