The authors describe the first mobile gaming app for learning accounting, Accounting Challenge (ACE). On September 30, 2016, ACE had been downloaded 23,230 times, spanning 90 countries, and had won three international teaching awards. The app was motivated by the aim to empower students to learn accounting in a fun way, outside of the classroom. ACE combines mobile learning and game-based learning to generate interest and motivation for the digital-native students and is freely available in iPhone/iPad and Android version. Based on a voluntary students' survey, the majority rated ACE favorably, indicating that they were satisfied with the app. ACE was presented at several international and local events and received positive feedback.