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Move Faster

Use the Right Analog stick to make you move forward. Then press R1 to execute a Hermes Rush shoulder charge before the roll ends, repeat this to move faster. You need to pull off the charge in order for this trick to work.

Unlimited Experience in Pandora's Temple

During Atlas's Quest in Pandora's Temple you will encounter a series of stone walls which you can climb. There will be several armored legionnaires that will try to knock you off of the walls.

First kill all of them and climb to the top of the tallest ledge. A glitch Harpy will begin to screech and will start to shoot at you, this will last for as long as you stay in the area. This is an easy way to raise your weapons and magic spells to the maximum. If you look close enough by one of the treasure chests you will see what looks like a holographic Harpy flying in one spot.

You need to be careful in this area but it is a great way to level up fast and pretty easily.

Harpy Puzzle Key

When you are in the room filled with Harpies that keep coming out, while killing them you will notice that they are coming out of odd looking holes. To stop them just use the shields of the statues in the room to block the entrance. The left statue is placed in the right hole, and the right statue goes in the left hole. Then once all holes are blocked off kill the remaining Harpies. Go up the stairs to the ledge with the boards that fall off when you are going across. Do not worry if you fall as the Harpies cannot get out. As the boards continue to fall, they will reveal the correct boards to walk on.

You need to get the holes covered as quickly as possible to avoid taking hits and losing health.

God Mode

Just beat the game on any difficulty setting. When you start a new game you can now activate God Mode. This will also unlock the other neat options and modes, including Deleted Levels, Birth of the Beast, and Challenge of the Gods.

Basically this will also unlock all the specials like Movies, Credits and a few other neat options.

Killing the Hydra with Slow Fingers

I've seen a lot of complaints from gamers unable to kill the Hydra by pulling it down over the broken mast because they were unable to press the O button fast enough. I'm 63 and don't have the normal reflexes or finger speed of the younger gamers. Here's how I did it.

When the O comes up at any time, I hold the controller down on my right leg with my left hand only, and make my right hand into a fist with the thumb sticking out. This way my right hand is free to rapidly staccato beat the O button with my thumb. Instead of trying to rapidly move your thumb you're actually using your wrist.

Source: vgstrategies.about.com