Meister Cody is an online training game with an integrated diagnostic screening test for children with dyscalculia and math weakness, the CODY Assessment. It was developed as a part of the CODY Project, a collaboration with psychologists and neuroscientists at the University of Münster, and technology experts at Meister Cody GmbH ( based in Düsseldorf). The educational video game is used by parents, teachers and therapists as a diagnostic and therapeutic tool. The scientific research at the University of Münster drove the development of the computer-based training software.