Steal hero

Out of the Muck: Begin Act 2 as a boat. Navigate water areas by sailing over blue-colored kelp ramps.

Clapperclaw Cove: Encounter crab-like creatures. Focus light on their orange kelp to make it grow. Follow the water to a kelp ramp, drop down, and take a left past a shipwreck into a cave.

Slime Grotto: In the cave, take the right path by breaking a blockade (A). Focus light on Wither sacs to create paths. Navigate through blockades and clear Wither sacs to open doorways. Follow the stream to reunite with Seabird.

Molter Run: Sail beside two whale-like creatures using only the L-Stick to move back and forth.

The Coral Sanctum: Dock at a pink coral house to pick up creatures. Use Twig (X) to lift a gate by coordinating L-Stick and R-Stick movements. Deliver three of the same critters to the big coral island. To get another critter, break blockades and focus light on a flower for the 'Guardians of the Sea' achievement. Cure Wither vines/sacs around a coral house to pick up a critter. To get another, light red/orange corals to attract crabs, then dock. The last critter is picked up by simply docking. Deliver all four critters to the main island to get a fuse. Bring the fuse to the device behind the main island to power a light. Sail toward it and clear large Wither roots to open a path, then sail over a blue kelp ramp.

The Lock Keeper: Power up a large machine by inserting a fuse. To get the first fuse, sail left to a coral house with lights. Use Twig (X) to move a claw to catch water, then move it over a crab. Focus light on the claw to overturn it, freeing a floating critter. Go to the locked gold gate, focus light on the eye below the large light to open it. Inside the cave, break a Wither sac to find a fuse. To free another critter, break Wither sacs on the left side of the cave.