This Lego Harry Potter: Years 1-4 walkthrough is divided into 86 total pages.
You can jump to nearby pages of the game using the links above.
BONUS LEVEL 4

Eliminate the Devil's Snare using Lumos Solem.

Release Scabbers into the pipeline.

Take the purple flower needed for the potion.

There's a crank by the wardrobe - turning it will adjust the water level. Now equip the earmuff, let the Mandrake's screech breaks the glass window.

Activate the puzzle to get the last ingredient.

Drink the potion, then roll down the green ball into the water.

Get rid of Devil's Snare.

Roll the balls into the holes to unlock the Gold Brick.
More Lego Harry Potter: Years 1-4 Walkthroughs
This Lego Harry Potter: Years 1-4 walkthrough is divided into 86 total pages.