With the advent of the information society in recent years, creativity is becoming increasingly important, and divergent thinking is gaining prominence. The Alternative Uses Test (AUT) is the most used test using language for evaluating divergent thinking. However, its result is affected by differences in native language and the evaluation is dependent on the person conducting the assessment. To solve these problems, we developed the Color Queue Creation Task (CQCT) as a new task. The purpose of this study is to demonstrate the validity of flexibility measured with CQCT. The experiment to validate CQCT was conducted with the participation of six university students. We asked them to perform the CQCT under three conditions: presenting color dot background, gray-scale dot background, and non-presenting. The position and color of the dots change over time. As a result, flexibility measured under the presenting condition was higher than under the non-presenting condition. This suggests that CQCT can be useful as a divergent thinking test. Future study should be conducted with a larger number of participants.