Ratchet and Clank Size Matters for the PSP may not be a difficult game for some people, but others may have difficulty getting through the levels. The unlock breakables for the PSP version of the game are the same as they are for the PSP game, but not all of the cheats are, if they can be found.
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Ratchet and Clank Size Matters Walkthrough: Sprout-o-Matic Shines Again The next room contain a few crates that will help you with extra items. Be sure to clear the room of enemies as well.
First you must beat the game. Then get your multiplier to 12 then go to metallis and the secret arena (where the circle of boxes is). Now kill the boxes save the game and then load the file you just saved.