"Jak II" is a video game developed by Naughty Dog and released in 2003. It is the sequel to "Jak and Daxter: The Precursor Legacy" and features a darker tone and more complex gameplay. Players control Jak, who gains new abilities and weapons as he battles against the oppressive Baron Praxis in the city of Haven City. The game introduces Daxter, Jak's sidekick, who provides comic relief and assists in various missions. Players explore an open world, complete quests, and engage in combat with various enemies. "Jak II" is known for its engaging story, character development, and innovative gameplay mechanics.