The Computer Science major is one of the most rapidly growing fields and offers some of the highest-paying jobs in the world. In the last decade, Computer Science studies have shown a general lack of female enrolments. Serious game can be employed to motivate and educate female players. However, although females have certain preference elements for digital games and game types, only a few studies have attempted to design games for females. Therefore, a gender-based serious game engagement model for learning Computer Science was developed. This study aims to verify the validity and reliability of a questionnaire designed to evaluate a gender-based serious game engagement model. Content validity involving three experts was conducted. Then, a pilot study with 31 students was implemented to test the reliability of the instrument. Data collected was analysed using SPSS version 21. Results show that all questionnaire constructs are reliable and consistent, with Cronbach’s alpha values of 0.7 and above. This confirms that the instrument designed is valid, reliable, and without errors.