Smash the row of boxes in the alley, then at the bottom, wait for the Charge Crab to do his thing before Spinning his butt.
And was it worth it.
Wumpa Gem 1 Wumpa Gem 2 Wumpa Gem 3 Box Gem 312 Fruit 468 Fruit 625 Fruit 173 Boxes Checkpoint 1 To begin this level, head forward down the pier, smashing any boxes you encounter along the way.