God of War III opening is widely considered one of the best game opening ever. Previous games of the saga already featured great openings but with this one, Santa Monica Studios outclassed themselves. Starting directly where God of War II ended, you find Kratos climbing Olympus Mountain with Gaia and starting a combat with Poseidon that will become bigger as the fight progresses. The ending of the video is one of the most brutal (and controverial) moments of gaming history.
(Note: the video includes intro credits and it’s divided in three because when I uploaded this, I still was limited to 15 minutes per video)
Bonus – Making of Poseidon
Video included with the game that details the creation process of the opening level: