Mega bolts!

Started off on the challenge play through and one thing that really stands out is how much more expensive everything is. In this mode the bad guys are much tougher, so to balance it there are super versions of all the guns, but they tacked on several zeroes to the price of all of them. To cover this increased cost the game now has a bolts multiplier, so the long Ratchet goes without getting hit the amount of bolts he earns increases exponentially.

I also have unlocked several of the cheats by pulling off some skill feats. On my first play through I only got a couple skill points at random, but now I'm looking up how and where to get each one.
So far I got cheats for:
-An old GDC trailer for the game
-Big head mode for Ratchet (more tiny/big/HUGE head mode)
-Neat concept art for the characters and some ships
-Enemy big head mode.