What is the master cheat in Tony pro skater 3 for PlayStation 2?

There is no master cheat in Tony Hawk's Pro Skater 3 for PlayStation 2. However, there are a number of individual cheats that can be used to unlock characters and levels, or to give you an advantage in the game. These cheats can be entered at the main menu screen by pressing the Triangle, Square, X, Circle, Up, Down, Left, Right, Up, Up, Up buttons in that order.