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Pause the game and enter: CIRCLE, SQUARE, CIRCLE, SQUARE, UP, DOWN, LEFT, LEFT
Go to any level where you have to capture a base(Blackwater, Aridia) and go to the last level. Hide behind the blockade and deploy your shield in front of it. The bar will move really fast.
Need easy stages to get weapon experience? Play the Annihilation Nation challene against Scorpio to rack up the XP. Some weapons, like the shield glove, may need different stages to gain XP. For the shield glove, try playing the battle missions in Marcadia and having the bevy of peons shoot your shield for XP.
Go to any challenge like Annihilation Nation, start the challenge and quit and it refills your ammo and health. This will save you thousands of bolts.
On planet Arida, when doing the assasination level, use the vehicle to jump over two cliffs. They are located next to 1 of the bridges at the right hand side of the starting point. Doing this will give you a skill point.
When fighting in the battle arena you will come upon matches where you weapon will auto switch after a few shots. To avoid this follow these steps. Start firing of shots till you get the hurricane. When it is out simply hold the fire button and don't let go or do a clank double jump and you will continue to fire the hurricane even though the weapon in you selector block will say something else. I find this easiest to do if you switch to lock-strafe-mode and then hold down R1 (fire).
During any qwark vidcomic, enter the following: Up, Up, Down, Down, Left, Right, Circle, Square, Square
At the main online menu highlight "Stats" and press Up, Down, Left, Right, Square
At Star Phoenix's comic room select chapter and press square. Enter YING_TZU and press start. This will enter the insomniac museum where these is a Bomberman type mini-game
In Edit Profile hold L2 and enter these codes:
Dan Skin: LEFT, LEFT, LEFT, LEFT, UP, RIGHT, UP, LEFT
Nefarious Skin: UP, UP, UP, LEFT, RIGHT, UP, LEFT, UP
In Metropolis go down the path into the first building. Hop onto the left window sill, break the window and hop to the next building. Jump onto the left side, break the window and enter the teleport between 3 am and 4 am to get to the Insomniac Museum.
Beat the game to unlock weapons you can buy that are an enhanced version of the weapons you already own. You can only buy if you have leveled them up all the way already. These cost a lot of bolts but are even more powerful then the level 5 weapons you already have and they can be upgraded another three times making them very powerful.
At Star Phoenix's comic room select chapter and press square. Enter _MEGHAN_ and press start. This will enter a pirate vs ninja mini-game.
You need titanium bolts to unlock these skins.
Old School Ratchet: From 1st game (or free with save file from 1st game)
First go to the planet Mylon and then get out your flux rifle. Then go to the very end of the platform at the very beginning of the level. Next shot both of the robonoid commender's. It will take some time to beat them but each shot upgrades your rifle to the v3. Then it takes 2 shots. If they both die (they will)just jump off and start over. Just keep doing this till it is up graded all the way (this will take tops 2 min.).