Knack’s co-op is a little different from some cooperative games you may have played. From the very beginning, Knack was meant to be both a challenging and rewarding old-school style character action game, as well an accessible “gateway” title for gamers to initiate their friends and family members into the joys of true console gaming. On Normal or Hard, the game can be brutally challenging and very rewarding. But with simple controls and Easy mode, even new players can experience the world of Knack.
In Knack, our two-player cooperative mode was designed in a way that accentuates the vision for the game. A second player can drop in or out at any time, and control Knack’s shiny metallic helper, Robo Knack. Robo Knack has a move set somewhat similar to Knack’s, but can donate parts to Knack and heal him with a touch of the Triangle button. If there’s a non-gamer or light gamer in the house, this is a great way to introduce them to the world of Knack – just start the game on Easy and drop in from time to time to help them through the game.
http://blog.us.playstation.com/2013/11/07/more-ways-to-play-knack-co-op-mode-mobile-app-detailed/
