GamesRadar writes: "Central to the new game is the Great Clock, a device built in the exact centre of the universe, designed to control the space time continuum. We learn that Clank's late father originally built it, so he ends up becoming its caretaker. Not only has Clank been liberated from Ratchet's back as his sidekick, but his role in the story has become much greater. Guided by friendly robot Sigmund (the junior caretaker), Clank's sections see you traversing the giant whirring gears of the Great Clock and learning how it works. And this is where A Crack in Time's puzzle elements come in."