Shadow of the Colossus (PS2)

Hard difficulty:
Successfully complete the game and save when prompted after the credits. A new game can now be started in hard mode.

Brown Agro:
Defeat all sixteen Colossi and unlock all items in Time Attack mode under the normal difficulty setting. Then, hold Square at the title screen.

White Agro:
Defeat all sixteen Colossi and unlock all items in Time Attack mode under the hard difficulty setting. Then, hold Circle at the title screen.

Reminisce mode:
Go to the corpse of the Colossi and press Circle to pray. The graphics will change to a old film appearance.