This Lego Harry Potter: Years 1-4 walkthrough is divided into 86 total pages.
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HOGWARTS CASTLE II

[Black Lake] You will begin in the Gryffindor Common Room. Follow the ghost to the Black Lake.

Character Token -- Blast the mole three times to get the Bassist character token.

Destroy three wooden crates.

Character Token -- Assemble a bridge from the debris. The Ron (Tuxedo) character token is at the end of the bridge.

Once you've assembled the bridge, you've save a student's life. Thanks to you, one more Student in Peril is saved! :)

Cast Wingardium Leviosa on the fishing rod. Assemble two frogs from the bricks.

Ride the frog, through a set of vine gates to get a Gold Brick.

Follow the blue pointing arrow to begin the next stage.
More Lego Harry Potter: Years 1-4 Walkthroughs
This Lego Harry Potter: Years 1-4 walkthrough is divided into 86 total pages.