Dynasty Warriors 3

All movies:
At the title screen, press L1, Triangle, R1, Triangle, L2, Square, R2, Square

All characters:
At the title screen, press Square, R1, Triangle, L1, Triangle, R2, Square, L2

All Shu generals:
At the title screen, press L1, Square, Triangle, R2, L1, L2, L2, R1

All Wei generals:
At the title screen, press Square, Triangle, L1, L2, R1, R2, L1, L2

All Wu generals:
At the title screen, press Triangle, L1, Square, R1, R2, L1, L2, L2

BGM Test option:
At the title screen, press Square, Triangle, Triangle, Square, L1, R1, R2, L2

Opening Edit option:
At the title screen, press R1, Square, L1, Square, R2, Triangle, L2, Triangle

Free mode all levels:
At the title screen, press R1, R2, L2, L1, Square, R2, Triangle, L1