For death students this should be easy, just learn all the death spells. If you are not a death student, well tough luck. Behind the door is the REAL death school, not the stupid kid in the jester hat.
You have to be a Death Student, that's level 16. (Bear in mind, you can't do it if you aren't a death student) Ask the guy who does the Death Spells and learn all the spells he teaches, then go to the door and you'll get in!
And if you are not death/lvl 16/know all death spells, DON'T EVEN BOTHER GOING BEHIND THE WATERFALL!!!
Hope that helps :)
EDIT by jaden: First of all, when you get to lvl 16 you can go in there even if your NOT DEATH to complete some quests.
To get through a door in wizard 101, you run into it.
Completing quests for the professor will allow you to get past the gates on wizard 101. Each quest received by talking to different people will open a different gate to the wizard 101.
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Just Go Out The Door :P
You either have to be a death wizard, beat Wizard city or whatever its called, or have a death wizard friend and teleport to him/her while your friends is inside of the death door.
The next project for wizard 101 is the oppsite of wizard 101.So its the bad side of wizard 101.
Kingsile created pirate 101 and wizard 101
wizard 101 was created in 2007
what are codes for wizard 101 for 210
Wizard Defense. It doesn't sound as cool as Wizard 101.
See my answer in How do you get to other worlds in wizard 101? See my answer in How do you get to other worlds in wizard 101?
Do lots of missions on wizard 101 and DONT'S SPEND YOUR MONEY! On Wizard 101 my screen name is JacobMoonDust