
Near the Professor's desk at the front of the room, you will find a Parseltongue puzzle. Place the wood in the burner beside the cabinet to find the first ingredient. Open the cabinet and pick up the wood that drops out. Walk over to the right side of the room and repair the hidden LEGO pieces to create a cabinet. Refashion them into a Spectraspecs dispenser and take another pair. On the left-hand side of the classroom, you will find a pile of broken LEGO pieces. Where, as you could imagine, you have to brew a potion. Place the gargoyles back on their pedestals and head into potions class. The gate is closed, so pick up a pair of Spectraspecs from the dispenser to the left of the door and repair the two gargoyles on either side of the gate. Head out of the Great Hall after the cutscene and follow the studs to your next class. Meet up with Dumbledore and head into the Great Hall. Once you have repaired the clock, its alarm will go off, and the gates will open so you can head through. Take another pair of Spectraspecs from the unit to the right of the Castle gates and repair the alarm clock that is broken on the ground. The knight will destroy the blockage for you so you can head through into Hogwarts. Repair the knight and its base and hand it the hammer. There are three piles altogether, each of which creates a base, a set of armor, and a hammer. Walk over to the orange glowing spot to collect some Spectraspecs of your own and find the three hidden objects by the blocked door. Thankfully Luna has some Spectraspecs that you can use to see hidden objects on the ground. When you get back to Hogwarts Station, your way through to the Castle has been blocked by Malfoy. Follow the studs back to Platform 9 3/4, and hop on the train.


Head down to the end of Diagon Alley and out the back of the Leaky Cauldron. It's finally time for you to return to Hogwarts Castle.
