Monkey Quest (lost online multiplayer game; 2011-2014)
Monkey Quest was a fantasy/MMO game developed by Behaviour Interactive and launched by Nickelodeon on March 2011 and closed on September 26, 2014.
Premise and Gameplay
The premise was that you played as a monkey traveling through the land of Ook, interacting with other players, completing quests, battling monsters, and discovering secrets about the legendary Monkey King.
Shutdown and Availability
The game's servers were shut down on September 26, 2014 so that Nick could focus on their mobile games. The launcher used to still be available for download for a while after the shut down, but it was unable to get the patch info and attempting to log in would have caused it to say the username and password is invalid. All that is known to remain of the game are some images and some online gameplay videos before the game's servers were shutdown.
As stated before, the game can't be played in any shape or form, so unless Nickelodeon decides to bring back the game's servers, it may never be playable again.