Grunt Birthday Party

This is one of the more fun Silver Skulls in Halo 3. The Grunt Birthday Party Skull is located on the second mission, Crows Nest, just before the area where you team up with the Arbiter, the piping area where you see Drones buzzing in and out of an array of pipes). Just before you jump down the pipe to meet up with the Arbiter, stop at the ledge, and look directly below you. Along the wall that you drop down, there is a small ledge with a green arrow pointing backwards. jump onto this ledge (rather than all the way down), and go inside this secret room. The skull is in the dead center of the room. This is my favorite skull because when you get it, if you get a headshot on a grunt, they blow up with confetti and you hear kids shouting "YAY!"