This research aims to examine the impact of mind and intelligence games which is played by children during the pre-school period. The research contains 60-72 months old 29 children who are in public kindergartens locate in Kağıthane and Küçükçekmece in İstanbul. In this research by using quantitative and qualitative methods, a mixed-method has been applied. Problem-solving skills scale for children which is developed by Oğuz and Köksal Akyol (2012) to collect quantitative data in this research. To collect qualitative data of the children who are in the test group semi-structured interview form which is developed by the researcher has been used. In this research test group consists of 15 children and the control group consists of 14 children. 100 hours of mind and intelligence games has been applied by the researcher to the children in the test group for 20 weeks. Ministry of national education’s curriculum has continued to apply to the children in the control group. According to research findings; when problem-solving skill scale points of the children in the test group and problem-solving skill scale points of the children in the control group are compared differentiation which is in the advantage of the test group is observed. The opinion of the children in the test group has been qualitatively analyzed. At the end of the research, it was concluded that mind and intelligence games are a method that can be used in children's problem-solving.
