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 Kaasa health (an mHealth tech company 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.