How do you get the halo 3 catch skull?On what diffcult?

It's on the level "The Storm" in the first dry lakebed area were the first AA Wraith is. Near where the wraith is firing at the Hornets there is a small circular structure. If you can do it on Co-op use a ghost, drive up to the high ground next to the strucure, jump on top of the ghost and crouch-jump up onto the structure.

If you do it on single player use a Warthog and get up the same way. Note: Remember to start the game on Normal difficulty or above. Catch: Catch, makes enemies throw grenades like there's no tomorrow.

Mission: The Storm Effect: "Pull pin. Count to three. Throw." -- Every NPC carries two grenades and throws them often.

You can get this by performing 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 that the skull is on top of, then use the box as a place to jump from. Note: Destroying the second wraith by the door makes this disappear.

Catch Skull Catch Skull Effect: Your Enemies throw LOTS of grenades. Catch Skull Location: The “Catch Skull” can be found on the fourth level, in the first area where you need to destroy the Wraith Tanks. When you enter this area, do not eliminate the Wraith Tanks (The skull appears when the tanks appear, and disappears when the tanks are destroyed).

The Skull is located on top of the circular building next to the Anti-Air Tank. You can access the roof using a grenade jump, or jumping on the back of a hog.

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