The Ravensburger Escape Puzzle The Circle London combines classic puzzle fun with an exciting mystery adventure. With 919 precision-crafted pieces, you assemble a detailed motif of a mysterious library with a dragon and a cliff landscape. But assembly is only the beginning: integrated riddles challenge your combinatorial skills. Using the enclosed decoder disc, you decipher hidden clues in the completed picture to solve the mystery. This demanding concept is ideal for puzzle fans and offers an interactive experience that requires logical thinking and creativity.