One of the principles of merdeka curriculum is meaningful and enjoyable learning that is designed according to students' needs. The application of these principles can be carried out at various stages of learning, including during formative assessments. The aim of this research is to analyze the use of Gimkit for formative assessment for students on the topic of colligative properties of solutions. The research was conducted in a descriptive qualitative manner with three stages of activities, namely preparation, implementation and reflection. Based on the reflection results, it is known that the use of Gimkit for formative assessment of the colligative properties of solutions was stated as good or very good by 95.8% of students. This is reinforced by the results of observations that students took part in the formative assessment with enthusiasm.