Educational games have started to establish themselves as a fruitful complement to traditional teaching methods since they can enhance motivation and actively engage learners with the subject matter. While educational games targeted toward single players still prevail, recent years have also witnessed a growing interest to incorporate collaborative elements into educational games to take advantage of the positive effects associated with collaborative learning.In this paper we introduce Metry Mouse Missions, an educational game which fosters collaborative problem-solving and engages young people, aged 8–11 years old, in the construction of complex geometric models through the interactive adventures of a daredevil mouse. A central aim of Metry Mouse Missions is to provide an inviting interface that supports exploration and intellectual curiosity about geometric constructions.