SECRET SOCCER BALL ON METROPOLIS!
You will need the sputnik skull.Then at the part where you come to the huge half broken window near the 2 wraiths, use a grenade to grenade jump into the window(it may take a few try's).There would be a metal beam.Jump on it and jump onto the one above it and you would be on the ruff.If you go to the left you will find a huge soccer ball!HAVE FUN!!
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