Mobile game-based learning (MGBL) is a serious game, that is, a game designed for educational purposes while still remaining entertaining. MGBL has been shown in numerous studies to aid pupils in learning and reduce psychological stress. This research seeks to develop MGBL for Integrated Thematic Learning (MGBITL) for elementary school students. Building MGBITL based on mobile game development theory and integrated thematic concepts required proper procedures. This research employed the MGBL Engineering Model, which consisted of three stages: (1) pre-production (discover & dream), ( 2) production (design), and (3) post-production (delivery). Literature review and distribution of online questionnaires to teachers were used to collect data about the principles of developing MGBITL for elementary school students. The MGBIT application, which consisted of 21 types of games adapted from the material for Class V Theme 8 Sub-theme 1, was the result of research activities. Hopefully, the introduction of MGBITL will aid teachers in teaching materials that need imagination, make subject matter easier to understand, and promote fun learning concepts. So that students are unaware that they are participating in a learning activity.