 Ratchet is forced to compete in an intense, underground bloodsport called DreadZone to ensure his, Clank's and Al's survival.For the first time in the series, Clank does not accompany Ratchet during the entirety of the single-player campaign, nor is he given playable sequences.While multiplayer is retained, an additional option to engage the game's single-player campaign as two-player co-op has been introduced, although it bears no effect on the outcome of the plot.