God of War - Platform: Playstation 1

Unlock The Fate of the Titan:
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Beat Spartan mode.

Unlock Visions of Ancient Greece:
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Beat game once (any difficulty).

Unlock A Secret Revealed:
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Beat Spartan mode.

Unlock Additional Costumes:
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Beat God of War Challenges.

Unlock Birth of the Beast:
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Beat game once (any difficulty).

Unlock Challenge of the Gods:
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Beat game once (any difficulty).

Unlock Character Graveyard:
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Beat game once (any difficulty).

Unlock Credits:
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Beat game once (any difficulty).

Unlock Deleted Levels:
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Beat game once (any difficulty).

Unlock God Mode:
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Beat game once (any difficulty).

Unlock Heroic Possibilities:
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Beat game once (any difficulty).

Unlock In-Game Movies:
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Beat game once (any difficulty).

Unlock Making of God of War:
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Unlocked from beginning.

Unlock Monsters of Myth:
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Beat game once (any difficulty).

Unlock Secret Message 1:
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Beat Spartan mode.

Unlock Secret Message 2:
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Beat God of War Challenges.

Unlock Teaser and Magic Teaser:
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Unlocked from beginning.

Move Faster:
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You can make Kratos move faster by rolling forward (press the Right 
Analog Stick forward) and cancelling the end of the roll with a Hermes 
Rush shoulder charge (press R1 when you've leveled up your Blades of Chaos). 
Repeatedly roll and shoulder charge to move forward at a much faster rate 
than Kratos' normal running speed.

Another Muse Key:
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There is also a Muse Key behind the statue of Atlas in Pandora's Temple. 
In The Challenge of Atlas room, after you make atlas pick up "earth," if 
you walk around him to the left, there is a chest behind him. Open the 
chest, and you are given a muse key.

Mini Game:
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In the Beginning of Act 2, there are 2 women in your bed when you are inside 
your ship. If you jump on the bed, A circle will appear above the bed, 
indicating a Mini-game. Press Circle, and the game will start. All you 
see is the vase, but as you get further, the vase will shake more and more, 
until it falls and breaks. you have to press the buttons as it commands it. 
closer to the end, you have to rotate the Left Analog Stick. If you win, the 
first time, you get a large amount of Red orbs. Everytime afterwards, you get 5 more.