Halo 3 Skulls are human skulls hidden in Halo 3's Campaign. The Skulls resemble those in the Multiplayer game variant Oddball and can be used as weapons in the same way. However, they lack the information text (i.e. "Press RB to pick up...") to pick them up. They are differentiated on the selection screen by their color, but are identical in-game. They are usually hidden and out of the way. Collecting 5, 9, and all 13 Gold and Silver Skulls will unlock the Hayabusa Chest, Shoulders, and Helmet Armor Permutations, respectively, for use in multiplayer.