Side Pocket 3 (PSX)

Hidden options:
Select story mode, then at the billiard table selection screen, hold L1 + L2 + R1 + R2 and press Select + Start.

Play inner trick stages:
Select trick game mode, then select "The Number" and "Game Count". Now highlight "Exit", hold L1 + L2 + R1 + R2, and exit this screen.