I haven't found them yet. I'm not interested. I just want to finish Forza because it's just so boring and I want rid of it.
But I found you a guide
Black Eye Skull: At the start of the "Crow's Nest" mission, without moving anything, you can see a huge pipe above you. Walk up the stairs, then up the next set. Turn to your left and jump up on the shelf unit. Jump to the red cross beam, then up onto the pipe. Then, just walk to the end. Walk over the Black Eye Skull to collect it. You do not have to pick this Skull up, it does it automatically. Its description reads "Bash your way to better health." When this Skull is active, your shield will instantly charge when you use melee attacks, and will not auto-recharge anymore.
Blind Skull: In the "Sierra 117" mission, when you get to the area where you see the Phantom overhead (one of the marines will point it out), jump over the rocks, and keep following the path on the right. When you get to the cliff, there will be a rock over the side. The Skull is on the end of the rock. The Skull description reads "Shoot from the hip." Note: This Skull has to be activated before you start a campaign map.
Catch Skull: In "The Storm" mission, perform a grenade jump off a Warthog or grab a Ghost and go back to the ramp from which you first came out, using the Ghost to push a big square crate back over to the front of the silo pod that the Skull is on top of; use the box as a place to jump from. The Skull description reads "Pull pin. Count to three. Throw." When this Skull is active, every NPC will carry two grenades and throws them often.
Warning: You can not kill any of the wraiths in this area or the skull will dissapear.
Cowbell Skull: In "The Ark" mission, pick up a Grav Lift from the small building near where you fight the Scarab. Then, proceed through the level until you reach the second sloping hallway (stairway). You should see some partitioned risers (platforms) halfway down. The Skull is on the top level. Throw the Grav Lift on the right side of the hall so it lands on the fourth little green dot from the door. Then, run, jump, and use the Grav Lift to propel you to the top. You should reach a checkpoint just as you enter the room, so if you miss you can try again. When this Skull is active, explosive force is increased.
Famine Skull: In "The Ark" mission, when you first go into the valley to the right after the wrecked Phantom, look to your left to see a huge boulder. Use a Ghost to get to the side of the boulder that is closest to the bridge overhead. It is easy to pilot the Ghost up the side of the wall using the thrust. To get the Skull, pilot two Ghosts up the wall to the top of the bridge and stack them on top of one another next to the beam where the Skull is placed. Then, jump from the top of the Ghosts towards the Skull and land on the beam. The Skull description reads "Trust us. Bring a magazine." When this Skull is active, dropped weapons will have very little ammunition compared to normal.
Fog Skull: In the "Floodgate" mission, as you are walking down from the anti-air gun you destroyed in the previous mission, there will be a ramp (next to a missile launcher). Around this ramp, there is a checkpoint. At this point, you should also hear a marine yelling, ?There! Over There!?. Look up and to the right, directly at the roof of the building next to the missile launcher. There is a Flood form (not to be mistaken with the two other Flood forms jumping in front of you), which is holding the Skull. Kill him before he jumps, and he will drop the Skull down to the ground where you can retrieve it. Note: Correct timing is required because if you kill him too early, the Skull will get stuck on the roof. The Skull description reads "You'll miss those eyes in the back of your head." When this Skull is active, your motion sensor disappears.
Grunt Birthday Party Skull: In the "Crow's Nest" mission, immediately after the first objective, while en route to the barracks, you will fall down to a pipe. Go to the end of that pipe, then look over the edge to find a small space a few feet below. Drop over, then quickly pull back to land under the floor you dropped from. The Skull will be at the end of this area. When this Skull is active, headshots will cause enemies to explode.
Iron Skull: In the "Sierra 117" mission, after freeing Johnson and killing all the Covenant that come in the Phantoms, walk to the Pelican that arrives to pick you up. Face the cargo bay, but instead of going in, turn left and follow the path. Once you hit the wall, jump up to your right to eventually reach a walkway. Walk all the way to the end. Take a left, then a right. At the end of this, a little bit to the right is a dark corner. Press Up to turn your light on and you should see the Skull. If you cannot see it, you are probably standing on it. Its description reads "Death carries a heavy price...". When this Skull is active, instead of losing 25 points when you die, you will lose 75.
Mythic Skull: In the "Halo" mission, follow the normal path until you reach a cave. Follow the right wall until it branches off into a small path. At the end of this path is some rubble, and in front is the Skull. Its description reads "Coverage under the Covenant health plan." When this Skull is active, you will get a 3x score multiplier for all kills.
Thunderstorm Skull: In "The Covenant" mission, after you shut down the first tower and get access to the Hornet, fly to the second tower (the one the Arbiter shut down). While walking up the stairs, go to the middle part that connects both, and there should be stairs leading up to a platform where the Skull is. The Skull description reads "Field promotions for everyone!" When this Skull is active, enemies will be much stronger.
Tilt Skull: In the "Cortana" mission, when in the circular type room with all the Flood, look for a small structure piece next to two archways. Jump on top if it, then go up on the rocks to the top left. Turn left and jump up again, then turn 180 degrees and jump to the rocks across from you. Then, follow the rock sticking out and leading up on top of the original circular room. The Skull is in a pool of blood. The Skull description reads "What was once resistant is now immunity." When this Skull is active, enemies will have different body parts that are resistance to certain bullet types.
Tough Luck Skull: In the "Tsavo Highway" mission, once you get past the part where you are forced to leave your vehicle, you will go through a tunnel and onto an open freeway. Immediately after coming out of the tunnel, you will see a huge pipe with two yellow ladders. Climb the second ladder. You should see a Regenerator power-up. Proceed to your right onto a small platform ledge where the yellow chain link fence is located. Jump onto that ledge, crossing over the fence. Directly behind you should be a large column that is holding up the giant pipe you were just on. Below that is a walkway. Fall off the ledge onto the walkway. Walk to the end of that. You should see a hidden ledge with the Skull on it. A few attempts may be requires to jump across. Its description reads "Your foes always make every saving throw."
All these were copied and pasted from
here
WBYD Skull: Wow, this skull was a wierd one. You have to go to the level "The Covenant" and *SPOILER
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after defeating the prophet and all the flood, while your on that bridge you will see 7 blue halo rings going down it. The entrance ring is number one, and the one nearest to the prophet is number seven. You must jump through them all in this order... 4-1-2-3-2-7-2-1-3-4-6-7-5-4-6-5-4-5-3-4 if you have done this right, the rings will start glowing and the skull will pop up on the blue bridge that you walk over to reach the prophet.
Thanks to
THIS site for helping me
That should help
Halo 3 skulls
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