We explored the effects of assessment gamification on students' content knowledge and perceptions of satisfaction, course experience, learning, and impact of teaching techniques. The course preparation, attendance, quizzes, classroom activities, and team projects of an undergraduate operations and supply chain management course had game elements that accumulate to team advantages in the collaborative midterm and final exam. Interestingly, we found that gamifying assessment activities resulted in significantly lower content knowledge, satisfaction, and course experience. Difference in perceived learning was not significant. Also, team exam scores were significantly lower in the gamified group, whereas individual exam scores were not significantly different. This study contributes to the literature by providing empirical evidence that gamification in classroom may produce unintended consequences and implementing gamification restrictively to assessment is ineffective at best. Directions for further research are discussed.