Instructions
Move the left analog stick back and forth quickly as soon as the battle begins. This lets you dodge Zeus' first attack.
Hold "L1" and press "Square" to block attacks as soon as you see Zeus execute them. If you do not block it in time, it is possible to jump over the attack to dodge it.
Use any desired combos to strike Zeus, but stay as far away from him as possible. When Zeus teleports across the screen, jump over him and quickly strike his back.
Use your Army of Sparta ability when you see Zeus fly over you. He is about to perform a very powerful attack, but Army of Sparta makes you temporarily invincible. When he lands, attack him as much as possible. Run away when the Army of Sparta meter is about to empty.
Run up to Zeus and press the "Circle" button when the prompt appears. Press the buttons that appear on-screen to damage Zeus and refill your health. Continue attacking Zeus, dodging the electric waves he throws at you. Hit "Circle" when the prompt appears again to end this part of the battle.
Run outside to enter the second phase of the fight. Trigger Army of Sparta if you have any power left. If not, use your Blade of Olympus to strike at Zeus.
Block Zeus' attacks with the Golden Fleece, and continue attacking him with your weapons. Shortly after Zeus takes a bit of damage, the titan Gaia appears. The next phase of the battle starts when Kratos falls into a rocky chamber.
Run up to Gaia's heart and destroy the protective barrier with the Nemean Cestus. When it is down, shoot the vines using the Bow of Apollo. Use any weapon to start destroying the heart. After a few hits, Zeus jumps down into the chamber.
Stay by the heart and attack it whenever you can to refill your health. Strike at Zeus when he comes near the heart. If you walk away, Zeus has the chance to refill his health.
Destroy the clones that Zeus makes of himself to find the real Zeus. Hold "L1" and "Square" when Zeus throws lightning at you to reflect it back at him. This severely damages Zeus.
Hold "L1" and "Circle" to throw Zeus to the ground when he starts flying around. After you have damaged him enough, press "Circle" at the prompt, then hit the random buttons shown on the screen.
Hold "L2" and "R2" together at the prompt to thrust the Blade of Olympus into Zeus. Hit "Circle" as quickly as possible when Zeus grabs you. This ends the battle.