You know that when you beat sandman the frist time your permantently in the black suit (for a while) and your even stronger than befor. You can be like that as well befor sandman but not for long.
What you have do is get the silver bar under your health to fill up so the black ora appers on the screen and when that happens you get better every second but remember you still have to take the suit off sooner or later

HOPE I HELPED

Just jump infront of a car than wait a few minites and you will see traffic infont of you.

First, you hav to unlock the falling trick race on top of the empire state building. Then, finish it in under 7secs to get 10,000 exp points. Wen you get back to the top of the building, save the game, reset the ps2, and do the race again to get 10,000 points. Then reset and start over. Keep doing this as many times as you want.