Instructions
Enter the Hogwarts Potions Classroom.
Walk to the bricked-up wall on the left side of the room. Use a Wingardium Leviosa spell to remove the bricks and reveal a pixie holding an apple.
Use an Immobilus spell to eliminate the pixie. Take the apple and throw it into the open cauldron at the front of the room.
Use a Wingardium Leviosa spell to lift the crate from the other cauldron, releasing a tentacle that kidnaps a fellow student. The kidnapped student loses his hair in the process. Add the student's hair to the cauldron.
Use spells on all three of the table's colored bottles to make a flower grown in the nearby pot. Remove the cherry from the flower and add it to the cauldron.
Combine the cherry with the student's hair and the apple to create the Polyjuice Potion and to win a Justin Finch-Fletchy character token. You will now have the ability to change into different people whenever you drink the potion.