Insomniac has launched a closed multiplayer beta for Ratchet & Clank: All 4 One on PS3 in US.
Being a limited beta, only those special codes have access - codes acquired through various contests online. If you want in (and you're a US resident), your best bet is to pre-order the game via Amazon between now and September 27. All pre-orders will qualify.
Insomniac also says: "Be sure to follow Insominac Games on Twitter and Like us on Facebook for some new contests and opportunities to get in on the limited beta," and RatchetAndClank.com will also apparently have limited codes available.
The beta lets you play with three friends through two sections in the game. Insomniac describes its contents:
"The first scenario is the opening level of Luminopolis where Ratchet, Clank, Captain Qwark and the evil Dr. Nefarious are forced to band together when Nefarious's light-eating Z'Grute is unleashed upon the city. The second area of the beta jumps you deeper into the action with The Vertigus Cliffs, set in the N.E.S.T. area of the treacherous Planet Magnus is a unique area full of vertical views that look stunning in 3D. The Vertigus Cliff level will also give you a chance to check out some mechanics from later in the game, including use of your weapon wheel and many of the crazy Ratchet & Clank weapons you've come to know and love. New weapons like the Frost Cannon, Plasma Bomb Launcher and Warmonger give you a great assortment of guns to play with, but old favorites like the Combuster are back as well. There are LOTS of weapons in the beta, as well as character's special ability."
The full game is out on October 18.