*SPOILER*
You need to put the phrisms in position to blast some powder kegs near the big pile of them. AFTER that, when the way is cleared, roll the boulder (with the help of Stinky and Loof) to destroy the remaining pile of powder kegs. Then your way will be clear. You don't need the Kaboom! NOTE: There is a SUPER SECRET FEATURE CLUE hidden somewhere in that level...
*END SPOILER*
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