Friends always manage, because they stick together, no matter what. Five friends are walking through the ancient Castle Balthasar, that is embedded in Europa-Park, one of the largest theme parks in the world. While having a break at Balthasar Castle, they step on a hidden trap door and fall into the underground of the castle. Below the castle they get lost in a mysterious maze of forgotten dungeons. They are all alone, but they know they can escape only together.

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