Super Mario Galaxy 2 Walkthrough

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The Deep Shell Well

Before diving into the titular spring, search the green mounds on the left side of the area for a warp pipe. You can open only three of these chests. Spin to grab a shell and then spin again to toss it into a chest and hope for 1-Ups!

Slide down the waterfall and collect coins. Press Z to dive under water and then spin to grab a turtle shell. The shell will propel you through the water. You won't have access to air for a long stretch ahead, so the extra speed boost the shell gives you is essential. You can also use the light beam it casts to kill the tentacles -- just shine it in their eyes.

Take a left just past the spiny purple urchins in the first tunnel to take a secret passage to the Comet Medal. Cross the large tentacle-fileld area dn swim up the stone passageway.

When you come to a brick wall, run into it head-on with your turtle shell to bust through. Avoid the tentacles and grab the coin in the lone bubble at the bottom. Shake to blast out of the water using the launch star at the end of the long passage.

At the midway flag, climb the steps to the left or right and long-jump to the 1-Up. Drop into the pool below. With shell in hand, cruise through the yellow rings to get speed boosts and air. Make sure you keep your shell!

Swim up the final incline avoiding the urchins and, at the top, you'll finally find yourself on dry land. Use your shell to bust open the treasure chest and collect the Power Star.