You unlock Nevermore at level 10. Usually nobody is at Nevermore but every once in a while you run into an equal number of high and low levels. Beware of the octopus.
<—:::—Skeleton Key Dungeon—:::—>
Upon walking around the different islands you might find a key. Both tourists and residents can find keys but only residents can redeem them for a prize. If you find a key then visit Dungeon Master Bob outside of the Dungeon to see what prizes you can get.
Prizes range from gems, to wishing stars, to expired Mystery Boxes. If you find a Golden Key then you can use it for a prize in the Skeleton Key Dungeon but if you acquire a Crystal Key then you can use it in the Crystal Dungeon! Go find a key now!
Also grab a Fright Box or a Haunted Box and see what cool items you can get! Items include Devourer Scarf, Danny the Dancing Devil, Crazy Candy, Catacomb Entrance, Toilet Paper, and Witch Doctor Boots.
Only on Wednesdays head over to the far left side of Nevermore. There is a raven that will sell you items 20% off. Like Get Upz except a wider selection and not for competition.