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Playstation 2 - MX Super Fly cheats

Go to the main menu, then enter the following button combination cheats:

Unlock cheat mode
Press Triangle, L1 + Left, Square, Triangle, L1 + Right, R1 + Down, 
R1 + Right, Select

Unlock all bikes
Press L2 + Square, L1 + Right, L2 + Circle, L1 + Left, Square

Unlock all riders
Press Right, L1 + Right, Down, L1 + Left, Right, Square

Unlock 250cc Freestyle event
Press Up, L1 + Up, Square, L1 + Right, L2 + Down, L1 + Left

Unlock every tracks
Press Triangle, Right, L1 +R1, Square + Circle, L2 + Circle, Square 

Unlock Special Fire motorcycle
Win the "Dominate 250cc Pro Freestyle Season" trophy

Unlock Special Tiger motorcycle
Win the "Dominate 125cc Pro Freestyle Season" trophy

Unlock Custom Fish motorcycle
Win the "Dominate 250cc Pro Race Season" trophy

Unlock Custom Playa motorcycle
Win the "Dominate 125cc Pro Race Season" trophy

Unlock Extra track editor barriers
Win the "Dramatic Entrance" trophy

Unlock Extra track editor movable objects
Win the "Impossible Stoppie" trophy

Unlock Extra track editor ramps
Win the "Impossible Wheelie" trophy

Unlock Extra track editor platforms and Station Z
Win the "Cross Training" trophy.

Unlock Custom Bee motorcycle
Win the "World's Highest Jump" trophy

Unlock Custom Fish motorcycle
Win the "Dominate 250cc Pro Race Season" trophy

Unlock Custom Playa motorcycle
Win the "Dominate 125cc Pro Race Season" trophy

Moves
Break move: Hold L2 or R2 and push Triangle, X, Triangle.
Swan move: Hold L2 or R2 and push Square, Circle, Square.
Propeller move: Hold L2 or R2 and push Triangle, Triangle, Circle. 
Olympic Podium move: Hold L2 or R2 and push X, Square, Triangle.