I figured out an easy way to unlock the costume for General Kratos which is the one where you have to get 20 Cylops eyes. (By the way you only get them from Berserk Cyclops which are the ones that have the guys climb on their back.) After you beat the game and then get Arena of the Fates from the Challenge of the Titans, set one of the enemies to Berserker Cyclops and make them respawn. Set your health to infinite if you don't want that much of a challenge, and just keep killing it again and again until you get 20 and it will say you unlocked a new costume. (Also, eventhough you'll get them faster by setting it to more than one cyclops, it gets kind of hard to maneuver around the arena when there is more than one.)
Urn of Gaia - Found in the Rhodes Palace early in the game. You earn 10 times the normal amount of red orbs.
Urn of The Gorgons - In the Blood River section outside of Euryale's Temple, use the golden fleece on the petrifying beams on the rolling platform to reveal this urn. Your weapon strikes will turn your enemies into stone.
Urn of Olympus - Found in the area near where you pick up the Spear of Destiny. Infinite magical energy.
Urn of Prometheus - Found inside Atlas Infinite Rage of the Titans. Urn of The Fates Achieve an overall rank of Mortal after beating the Challenge of the Titans. Extends the time it takes for your combo meter to decay.
Urn of Poseidon - Achieve an overall rank of Spartan in Challenge of the Titans. Allows you to replace Cronos' Rage with Poseidon's Rage.
Experience gift chest: when you enter the bog of the forgotten you will see two chests but you won't reach them cause you will get into fight with the barbarian king. After beating him and euryale you will return to the place before the bog of the forgotten, enter again, open the rare chest and you will receive a experience gift
Health gift chest: at the west auditorium you will see the translator killing himself. When enter the mirror, instead of saving the man, go back to the place where the statue of fates where and there is health gift chest
Magic gift chest: when you enter to the underground, you will cross a place using a rope but you will only get to the middle when some archers cut the rope. After killing every one, you will start climbing to a place with chest and enemies kill them all and take out your bow, you will aim to a wall, start shooting and this will reveal a compartment with two chests and one has the magic gift
A little while into the area of Rhodes, the first area of the game, you will drop down into a bath-house/sauna type area. Instead of continuing and diving down, jump out of the water onto the area around it. There should be two screens which are breakable. Behind one of the screens are two topless women. By walking up to them and pressing the circle button, you initiate the sex mini-game in which you complete a series of button presses. When you have won, you will receive a large amount of red orbs and some green orbs. You can only receive the orbs once, however you may play the mini-game as much as you'd like.
Athena - Complete on Titan mode.
Hercules - Complete on Titan mode.
Dark Odyssey - Complete on "God" mode.
General Kratos - Collect 20 Cyclops eyes.
God Armor (doubles stats) - Get a God ranking in Challenge mode.
God of War costume - Complete on any difficulty level.
Hydra Armor - Complete on any difficulty level.
To Start a new game with all Weapons/Magic at the levels you completed the game at, simply save your game and start a new game. Choose the Bonus Play option and you can start a new game with all your weapons/Magic at the levels you beat the game with. You can only choose the Bonus Play option on the difficulty you've beaten the game on. They will be marked by a sword on the New Game screen.
After you defeat Euryel and go up the stairs, you go back to the place were you meet the Barbarian. There are two chests a large chest, and a red orb chest. Open the large one, and it will say you have gained the urn of power. Then like a jackpot of orbs come out!
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