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Professor Kloridric has struck again! It's Elena, Valérie and Camille's turn to be trapped in his terrifying house. They must escape as quickly as possible to avoid becoming guinea pigs for his terrible experiments! To achieve this, the trio must explore three different rooms in detail: the study, the basement and the laboratory. In each of these rooms, the teacher has prepared a series of riddles on the theme of astronomy. Solving each riddle will enable them to find one of the three numbers in the ultimate combination. Will our team manage to escape, or will they be trapped in the house forever?