The proposed project, sCool, is an adaptive mobile game designed for STEM education. In this work, we present a new iteration of sCool in efforts to further examine contributing factors of engagement and comprehension. The new developed game experience for acquiring object-oriented programming skills is divided into two parts: concept-learning and practical. In the concept-learning part, the users explore a virtual environment filled with puzzle-pieces hinting theoretical concepts, preparing the users for the practical part. Users need to solve a programming challenge in Python, directing game-objects on a checkerboard to certain fields. Conducting a study involving 39 school students and three teachers, we are able to successfully display an enhanced understanding of different programming concepts.