The Catch skull is on the level [b] The Storm. [/b] The effect is it makes EVERYTHING get more grenades. When I mean everything, I mean everything. One day while I was playing I had a flood throw a sticky at me. A STICKY+FLOOD=ldjfhglisudgbslbv

[i][b]ADMIN NOTE:[/b] I've never seen Flood throw grenades, even on Cortana on legendary with the Catch skull on, so I'm not actually sure this is possible.[/i]

This skull is found on [b] The Ark. [/b] The effect of this skull is it makes weapons that enemies drop, have half ammo. So for instance, say you pick up a beam rifle that you got from killing a jackal. It usually has close to 88 charge right? Well now if you're lucky it'll have 41 charge. Makes the search for weapons longer however it gives you a 2x multiplier on campaign scoring. Anyways, onto finding the skull.

First I'll start with the background info on these. There are 7 terminals and all of them are located on The Ark, The Covenant, and Halo. To get the achievement for getting all the terminals you have to read through the message until the terminal says, [b] "FRAGMENT ENDS" [/b] except for two occations where it says [b] "[35:52:75:63:64] xx01-83-244.53" [/b] and the other is [b] "ALL RECORDS CEASE" [/b] The Achievement you get is "Marathon Man" and I think it gives you the security armor shoulder. The Security armor is actually just a remake of the armor the main character wears in an earlier Bungie game, "Marathon". I also here there is another terminal however I haven't bothered to look. Sorry. Anyways on to the terminals.

Tough Luck is a gold skull. It is the first skull on the third level, Tsavo Highway. As a gold skull, it offers an achievement and 150% bonus on campaign scoring. In return, enemies will have much better luck dodging your grenades, needles, vehicles and plasma bolts.

After emerging from the end of the first shielded tunnel and onto the Tsavo Highway, walk along the edge of the gorge to your left. Jumping carefully down onto the bridge support, walk around the edge of the supports to your left until you reach a stone ledge with this skull.

Grunt Birthday Party is a silver skull. It is the second skull on Crow's Bridge. After clearing the Barracks, you'll be sent out to meet the Arbiter. You'll drop down a short, narrow shaft at the end of a corridor and find yourself in a large tunnel with several pipes interconnecting from the left and right sides from which Drones will emerge-- they'll fly across from one pipe to the other in front of you.

The Black Eye skull is a gold skull. It is the first skull on the second level, Crow's Nest, and is in the same room you start in after the cinematic, high above your head atop a large pipe.

Getting to it is relatively easy. Walk to the end of the room, up a short staircase, and turn around and look for a green shelf. Jump up on that, up onto a girder, and from there up onto the large pipe. Walk back the length of the room to the end of the pipe nearest the video screens and claim this skull.

Iron is Halo 3's second skull and the second skull on the first level, Sierra 117. It is the game's first gold skull.

As a gold skull, it gives you and your cooperative play teammates the Iron achievement if any player picks it up during the game. After picking it up, it can be activated in the campaign settings page of the pre-game lobby.

When activated, this skull will force all cooperative players to reload the previous checkpoint if any of the players die, and will force a solo player to repeat the entire level if he or she dies.