The creation of a «Serious Game» can take several approaches, ranging from total creativity to the adaptation of an existing game. A game engine calls on a set of software components as diverse as scripting, the graphics engine, artificial intelligence, the physical effects engine, the audio engine and networking, all of which come into play in the design of a Serious Game. The aim of this research is to find out how game components, otherwise known as game assets, interact with each other in the design of a Serious Game to contribute to learner motivation The research aims to understand how the components or assets of a «Serious Game» interact to motivate the learner. A study was carried out with 50 3rd grade students, aged between 14 and 16, who were experiencing difficulties in mathematics. These students, familiar with digital technology, were immersed in a game designed to reinforce their mathematical skills. The aim was to demonstrate the effectiveness of the «serious game» as a pedagogical tool, and to underline the importance of adapted game assets for maximum immersion and interactivity. Following a questionnaire, the analysis showed a moderate correlation between the various game assets, confirming that graphics, sound, mechanics, narrative, interactivity and accessibility are crucial in the design of an educational game.