360 Halo 3 Blimp

Go to ghost town in forge mode and have to have two people playing.
Get a turret then go to the place where there is fencing and put the turret next to the fence.
Get on the turret and then have the other person lift the turret up in forge mode and look at the ceiling.
Then have the person put it down and you should be on the other side (you have to have the legendary to do this at this place).

Go to forge and switch network to local.
After that start forge and have somone pick up a gun (as a human) while you pick it up (as forge robot).
You will know if it works because they will hold the weapon funny (weapon invisible).
Then hold right trigger and use the left and right sticks to explode their arms!
Use shotgun or sniper rifle as the weapon.

Go to Forge on Last Resort. You will need an open crate, a deployable cover and a grav lift.
Set the open crate upside down and use the deployable cover in it.
After that get the grav lift and go inside the crate.
Use the grav lift under the deployable cover and the crate will start to fly.
Note: You have to use deployable cover first, then use grav lift.
Also, you may die and it might take some practice.

right!