A series of flashbacks reveals that an oracle had foretold that the demise of Olympus would come not by the revenge of the Titans, who had been imprisoned after the Great War, but by a marked warrior. The Olympians Zeus and Ares believed this warrior to be Deimos, the brother of Kratos, due to his strange birthmarks. Ares interrupted the childhood training of Kratos and Deimos, with Athena on hand, and kidnapped Deimos. Kratos attempted to stop Ares, but was swept aside and subsequently scarred across his right eye by the Olympian.
The gameplay of God of War: Ghost of Sparta resembles that of the previous installments. It is a third-person single player video game viewed from a fixed camera perspective. The player controls the character Kratos in combo-based combat, platforming, and puzzle game elements, and battles foes who primarily stem from Greek mythology, including minotaurs, cyclopes, harpies, Gorgons, and satyrs. The undead legionnaires,keres wraiths, geryons, automatons, Boreas beasts, and Triton warriors were influenced by the mythology, but created specifically for the game. Platforming elements require the player to climb walls, jump across chasms, swing on ropes, and balance across beams to proceed through sections of the game. Some puzzles are simple, such as moving a box so that the player can use it to access a pathway unreachable with normal jumping, but others are more complex, such as finding several items across different areas of the game to unlock one door.