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.
Silver skulls however will not give the gamer, gamer points when they have been found. They do however unlock achievements. There are 4 Silver skulls that are available to be found, and these skulls will change the appearance, dialogue and physics of the game. An example of this would be if the gamer found the IWHBYD skull. Once this skull has been found and the gamer puts it to use, they may hear AI Brutes saying ‘Pie is good’ or hear AI Marines yelling out ‘THIS IS SPARTA!’ during game play.