Once again you are Daxter riding around on a missile. Again this is all about learning the course, learning where to turn and what angle to approach a given target to prepare yourself for the next one. Practice until you get the course down.
Your next mission is about a Blast Bot. This really didn't involve any challenge at all - you just blast away until you get through everything.
Head on over to the shield. Now you're told to go to the bottom of the catacombs. The Baron calls you a "dark eco freak" and wants to lead it. You get the Peace Maker and head on over. Blow up three boxy things and go in.
First, go hopping over the laser beams. Go up to the higher level and more laser beams are up there. Now head into a water area. Go smack the red button and a door opens. Slide down the water. Note you can jump up to the ladder to get to ammo, 2 eggs and health. Splash around in the water, go on your board to jump up on the grate to get to an egg. Now hop upstream on the boards or take the hoverboard up. Next, jump up the stairs on the left of the waterfall. Move across and right.
When you go up to the lever you get a cut scene of you pulling it and of a machine powering up. Now you can't go the green way - only up the elevator. Go up to to the lightning bolt symbol door on the upper floor. You find an AI construct there. He says he can put you into the system to beat it.
The ocelot goes in for a game of pacman! You can zoom faster by using the X button. Be sure to eat the thing that drops new dots - it will appear shortly into the game. Just play pacman, eating all the dots, to win.
Before you leave for the desert, go back to the big towers if you haven't gone up them already. Do the crouch jump at the rungs to get all the way up to the top. There are tons of gems here,and then get on the sliders for the eggs.
Jak and Daxter 3 Walkthrough