cZeus puzzles provide a refreshing way to boost numeracy, agility, times tables, logic, mathematical fluency and working memory! In collaboration with Imperial College London, we have introduced cZeus School League App. This app, available on most platforms, is an ideal tool as an alternative teaching tool for testing and motivating students. Especially in the COVID environment, teachers can set up teams and challenges amongst their pupils, enrol their teams in public tournaments, and assess students’ performance. Teachers can also access their School Web-Portal for extended facilities such as in-depth analysis of results and easy bulk pupil registration..