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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.

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.

Ico Symbol
If you use a memory card with an Ico save-game on it, your horse Aggro will have the Ico "I" logo on its forehead as opposed to the usual mark.

17th Colossus
To unlock the 17th colossus, beat all 4 modes. Then, climb the outside of the temple to the secret garden. The 17th colossus will appear in a short cutscene like the other colossi, smashing the rear wall. After you fight him, the path to the very top of the temple will be opened, leding to a very "special" surprise.