How do you get to kroktropia on wizard101

Edit: Finish all the main quests on Cyclops Lane, Triton Avenue and Firecat Alley, then defeat Foulgaze and then Lord Nightshade. After that, return to Ambrose to get the Spiral Keys for Krokotopia and Wizard City.

Update: It costs real money to get to Krokotopia. You can either spend 915 Crowns at the Spiral Door, or upgrade your account via the official website. I would go with the Crowns option, since you can get much more than 915 Crowns for only $5, while an account upgrade costs $9.95 per month. But it's your choice! Have fun, and see you there!