Ratchet & Clank: Up Your Arsenal Cheats

Holostar Studio Platinum bolt
When you've already beaten this level, go to where your ship is, and (gravity boots required) there should be a trail that goes up into a building. Defeat those tyrranoids (Plasma Storm recommended) and there should be one platinum bolt when you've reached the end and climbed a pillar. The other one is on the other gravity-boot path when you had to walk spiral-upside down. The final one is on the right hand theater seats when you use Ratchet.