Hogwarts

You are in your room at home, minding your own bussiness. Suddenly, an owl knocks on your window.
It's a letter from Hogwarts School of Witchcraft and Wizardry! But who could have sent this? There is no signature.

"""
Player, Hogwarts needs your help!
Dark forces have risen, we can not figure out what is happening on our own, we need your forensic skills.
Ron and Hermiona are already on their way.
For security reasons i cannot reveal more in this letter.
Meet us at the Willing Tree.
"""

Will you send the owl back with a letter? Or hop on the train from station 9¾?

Challenge Levels

Level 0: Entry Point
SSH into the system to find the password for Level 1.
The password for this level is hogwarts_level0
Level 1: DireCtor Sync
You're a wizzard, Player!.
Level 2: Reborn From Ashes
Help Dumbledore in this fight.
Level 3: Room of Requirement
Can you find the secret enterence?
Level 4: Revelio
Bravery, revealed in total.
Level 5: eXELliarmus!
Disarming the attacker by exposing their actions.
Level 6: Wingardium Leviosa
Levitating Cookies
Level 7: Pensieve
Is this he-who-must-not-be-named's doing?