Tony Hawk's Underground Hints for Gameboy Advance
Go to any level that has a halfpipe in it Unlock the area with the halfpipe in it Go to the half pipe. Ramp up and down the sides of the halfpipe to get a lot of speed and air. Next, ramp up a side of the halfpipe and do as many flip or grab tricks in the air as possible. When you do this, do as many of one trick as you can. To do more than just one trick, hold a direction and tap L or R. To get even more of one trick, if you are going for air stats (do more than one grab trick in just one combo) do Nosegrabs by holding Up and tapping R. If you are going for ollie stats (do more than one flip tricks in just one combo) do Pop Shove Its by holding Up and tapping L. The moment you land back on the ramp, press R to do a BS Revert and continue the trick. Then, ramp off the other side and do the same thing again until you are going to slow to go up and jump up the side.