MyARTS, an interactive grammar mobile game is exclusively designed according to the Theory of Variation (ToV). The game provides a variety of exercises to expose learners to different aspects of learning. The study is to examine the elements that support the design of the questions in the digital game.  A qualitative content analysis was used in illuminating the elements from the theory that support the game and quantitative pre-and post-tests to see the impact of the game on learners. The features in the ToV guiding the game's tasks help learners to discern and remember the usage of articles. Keywords: The Theory of Variation; Grammar; Interactive; Mobile-Assisted Language Learning eISSN: 2398-4287 © 2022. The Authors. Published for AMER ABRA cE-Bs by E-International Publishing House, Ltd., UK. This is an open-access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians/Africans/Arabians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia. DOI: https://doi.org/10.21834/ebpj.v7i20.3430