HSX Hypersonic Xtreme - Platform: Playstation 2

All cars:
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Hold L1 + R1 and press Triangle, X(2), Circle, X, Circle, Triangle, X at 
the main menu. 

All tracks:
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Hold L1 + R1 and press Square(3), X, Triangle(2), Square, X at the main menu.

All track editor features:
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Win all the Arcade Circuit and Slalom Series races in either first, second, 
or third place.

Building Shop:
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At the main menu hold R1+L1 and press x, x, x, triangle, triangle, triangle, 
square, square, square, circle, circle, circle, x, x, x.