God of War is an action-adventure video game series loosely based on Greek mythology. Debuting in 2005, the series has become a flagship title for the PlayStation brand, consisting of seven games across multiple platforms. The main trilogy and its prequel—God of War I, II, III, and Ascension—were developed by Sony's Santa Monica Studio and published by Sony Computer Entertainment for the PlayStation 2 and PlayStation 3 video game consoles. Ready at Dawn developed the PlayStation Portable installments—Chains of Olympus and Ghost of Sparta—which were also published by Sony Computer Entertainment. Capcom published both PS2 installments and Chains of Olympus in Japan. The mobile phone Java ME installment—Betrayal—was developed by Javaground and Sony Online Entertainment's Los Angeles division, and published by Sony Pictures Digital.
In addition to the individual games, two collections featuring remastered versions of both PS2 installments—God of War Collection—and both PSP installments—God of War: Origins Collection—have been released on the PS3 by Bluepoint Games and Ready at Dawn, respectively.