Dave Mirra Freestyle BMX 2 - Platform: Gameboy Advance

Roof rides:
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Hold L and press A, B(2), A(2), Up, Down during game play. 

Flip off bike:
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When you start on the second course, grind on all the rails in 
front of you. When you get to the water fountain jump, take a 
left. Go up the quarterpipe. Gain as much speed as possible. 
Do a 50-50 Grind on the rail that is all the way to the left. 
Go off the quarter-pipe. Gain as much speed as possible. Do a 
50-50 Grind on the same rail except jump off at the bend. Go 
straight and crash into the wall. You will flip off your bike. 
Note: Do a freeride first to practice.