Creativity is an important aspect of early childhood development that needs to be stimulated through appropriate and enjoyable learning activities. However, the creativity of children aged 4–5 years at PAUD Nurul Jannah was still relatively low and had not developed optimally. This was indicated by children’s difficulties in creating various forms of block structures, combining different building shapes, and expressing ideas or suggestions when engaging in LEGO construction activities in Group A. Therefore, this study aimed to improve the creativity of children aged 4–5 years through LEGO play activities at PAUD Nurul Jannah. The research employed Classroom Action Research (CAR), also known as classroom action research. The subjects were seven children aged 4–5 years at PAUD Nurul Jannah. The results showed an improvement in children’s creativity through LEGO play activities. In the pre-cycle stage, the children’s creativity achievement was 34.97%. In Cycle I, creativity increased by 15.93% to 50.90%. Subsequently, in Cycle II, creativity increased by another 25.40% to 76.30%. The results indicate that LEGO play activities effectively improved children’s creativity and achieved the predetermined target of 75–80%. Therefore, the classroom action research was concluded and declared successful.
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