WOLFWORLD is an event world that was introduced on the 2nd day of Player Appreciation Week 2015. A player can enter the world using a Wolf Whistle, where they will head to one of the seven WOLFWORLD's (WOLFWORLD_1 to WOLFWORLD_7).
Entering the world "WOLFWORLD" via a door or the world selection screen would not teleport you to the actual WOLFWORLD. It will lead you to a tribute of WOLFWORLD.
If you attempt to enter it, it will say "That world is beyond you at this time".
To view a list of WOLFWORLD prizes, visit WOLFWORLD Rewards.