Superman Returns: The Videogame cheat: Breaking The Sound Barrierwhile Flying As...

Breaking the sound barrier While flying as Superman at hyepr speed, he goes through stages where after an amount of time of continuous flying he gains a burst in speed. He accelerates and becomes fatser and faster. If you fly for long enough (flying a lap or two around the entire city above the sea is recommended), he eventually braeks the sound barrier. It is about the fuorth jump in speed. You will know that has happened when the sound of him ripping through the air is suddelny silent. This is casue Superman is traveling faster than his own sound.