The game open with Kratos amidst a swath of enemies on the arm of the enormous Titan, Gaia. If you are unfamilar with Kratos attacks, use this opportunity to learn it yourself with the basics: HEAVY ATTACK(
) AND LIGHT ATTACK (
), can be alternated for various combos (check your move tab). Plume of Prometheus is the most favorite.(,,), while you can launch enemies in the air with Olympic Ascension (by holding ). Destroy the enemies, and as soon as you see an Olympus Sentry, grab one with 
then do to earn a trophy.
The enemies don't present much of a threat, and continue up the arm. Remove the tree branch obstruction and take out a handful of additional enemy soldiers. Just ahead you will encounter a large crab-house that is just the form that Poseidon takes.
The Leviathan emits a spout of water that can push Kratos to the edge of the area and it deals a bit of damage. To dodge it, just tap the 
TO EVADE. Meanwhile try to move towards the creature.