Ratchet and Clank: Size Matters Tips

Clank arena
You can play as clank in challenges by using clank arenas. To find clank arenas, you must see a blue television screen. But when you go close to it and press triangle, then you can do three types of challenges. Which would be hover car smashing, gadget bot puzzles, and gadget bot toss. But the only clank arenas are in Metalis and Dayni moon.

Alternatively: After you got all of the skill points, or set your time to 2:42 AM you can go to the treehouse there on the biig tv you can play some challenges.