Mortal Kombat: Deception is a fighting video game developed and published by Midway as the sixth installment of the Mortal Kombat (MK) video game franchise. It was released for the PlayStation 2 and Xbox in October 2004, for the GameCube in March 2005 and later ported for the PlayStation Portable under the title Mortal Kombat: Unchained in November 2006. Mortal Kombat: Deception follows the storyline from the fifth installment, Deadly Alliance. Its story centers on the revival of the Dragon King Onaga, who attempts to conquer the realms featured in the series after defeating the sorcerers Quan Chi and Shang Tsung, the main antagonists in the previous game, and the Thunder God Raiden, defender of Earthrealm. The surviving warriors from the previous titles join forces to confront Onaga.
Twenty-six characters are available to play in the game, with nine making their first appearance in the series. Deception contains several new features in the series, such as chess and puzzle games with the MK characters and an online mode. The Konquest Mode returns from Deadly Alliance, but follows the life of Shujinko, a warrior who is deceived by Onaga to search for artifacts to give Onaga more powers. Deception’s Konquest Mode differs greatly from the Konquest Mode of Deadly Alliance, however, containing elements of open-world exploration in between story progression, rather than the Kombat Tower of Deadly Alliance.