The game "God of War: Chains of Olympus" received a Metacritic rating of 91, whereas the game "God of War: Ghost of Sparta" only received a Metacritic rating of 86. Both scores are based on aggregate reviews from multiple critics.
Both games were developed by Ready at Dawn, which was founded in 2003 by former members of the developer Naughty Dog, known for the "Jak and Daxter" and "Uncharted" series. Ready at Dawn primarily develops games for Sony’s handheld console, the PSP. The company's first game was a spinoff of the "Jak and Daxter" series, entitled "Daxter." Soon thereafter, the company began work on "Chains of Olympus." The game was released in 2008 to wide praise. Metacritic named "Chains of Olympus" its 2008 PSP Game of the Year.
Soon thereafter, Ready at Dawn began development on "Ghost of Sparta," also for the PSP. When the game was released in 2010, it received high praise compared to other PSP games, but many critics felt it was not as interesting as previous "God of War" games. Some felt that the story and puzzles were bland and uninspiring. Other complaints focused on the short length of the game. The game also suffered from comparisons to "God of War III," which was released on the PlayStation 3 at the same time.