Halo 3 skulls allow gamers to make the game more challenging or interesting. They can do things such as: Change dialogue, appearance and physics as well as game play. These skulls can however can cause much frustration. Since they are located out of the way in many levels, gamers may not know where to look for them, since they are always located out of the way. There are however different walkthroughs available for them, to be able to help them to locate all of the skulls.

There are two different categories for the Halo 3 skulls. There are the Gold skulls and Silver Skulls. Both of these categories do achieve something different. With the Gold Skulls there are 9 in total that can be found. Once the gamer has found a gold skull for the first time they will achieve 10 gamer points. When all 9 gold skulls have been collected, the gamer will unlock the body and shoulder Hayabusa armor that can be used for their online character. The gold skulls can affect game play by making the game more challenging.