Few things scream Halo so much as venting a Grunt's cranium to the sound of cheering children and a burst of confetti. Well, you'll be glad to know that Grunt Birthday Party is still available in Halo: Campaign Evolved. This skull collectible, alongside the other 32 added to the game, is actually available in the new bonus missions.
Though this guide won't contain anything particularly spoilery, I will describe a few details about the final bonus mission in order to indicate where the skull is, so be aware. All that said, here's where to find Grunt Birthday Party.
Halo: Campaign Evolved Grunt Birthday Party location
You can find Grunt Birthday Party in the third and final bonus mission, Heavy Burden, so not in the main camp...
English (US)