Go to forge and select Sandtrap and get all the fusion coils you can.

Place them in the middle of the map at the of the towers, then buy all the fusion coils you can and put them there too.

Then save it and play it in custom games. Go to the top of one of the towers and jump on the fusion coins.

Then throw a bomb at the fusion coils. If done correctly you should go to the rings of halo.