This research is motivated by the phenomenon of lack of stimulus for mathematical intelligence of children aged 4-5 years, namely children are not yet able to count numbers 1-10 completely and clearly, do not understand basic mathematical concepts, and are not yet able to order numbers 1-10 correctly and properly. The lack of stimulation given to children makes children passive, not as many abilities as children aged 4-5 years in general. This study aims to improve mathematical intelligence. The research was conducted at Raudhatul Athfal Darul A'mal, South Jakarta with research subjects being 10 children aged 4-5 years. The research method used is the Kurt Lewin PTK model, the research was conducted through the stages of planning, implementing actions, monitoring or observation, and reflection as a basis for making re-planning in the next cycle. This study proves that the application of modified harvest moon 2D games can improve the mathematical intelligence of children aged 4-5 years. The results of the data that researchers can show: first, the results of the pre-cycle data were 58% which showed that the level of understanding of basic mathematical concepts was still low so that cycle I actions were carried out. In cycle I, the percentage was 81% and increased by 25%8, students have not been able to achieve the expected target of 90%, so it needs to be continued in cycle II. Second, the results of cycle II observations showed a good increase. The results of the observations were 98%, an increase of 17% from cycle I. so that the results obtained were that the activities carried out in cycle II achieved results exceeding theexpected target.