| It's on the level "Metropolis" on any difficulty I do believe. Use the same method to get a Banshee through the tunnels as you would if you were getting the Scarab Gun. (See the corresponding cheat for more details) Now take your Banshee away from that half-dome thing and fly through the level using the same path you would as if you were walking. Once you get to the highway where the Warthogs are fighting the Ghosts, keep flying straight toward the half-demolished building. Fly into it and go to the bottom level. Behold! A giant soccer ball! It's great fun to mess around with, especially if you have the Scarab gun.
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