Ratchet and Clank: Before the Nexus is available now for Android and iOS.
Announced in late October, the free endless runner ties directly into the duo's recent PlayStation 3 game, Ratchet & Clank: Into the Nexus. In Before the Nexus, players will earn Raritanium, which they can transfer to Enter the Nexus. You can download the mobile game from Google Play and the iOS App Store.
For more on the related PS3 game, be sure to check out Polygon's Ratchet & Clank: Into the Nexus review.