Quizzes are a widely used method for enhancing student performance in college-level courses. This study examined the effects of weekly quizzes for credit versus weekly quizzes for no credit on the performance of undergraduate students in two sections of an Introductory Psychology course. Results suggest that giving quizzes for credit led to better quiz performance and class attendance compared to offering quizzes for no credit. However, quizzes for credit offered little added benefit in terms of exam performance or overall course grade. The authors share suggestions for incorporating weekly quizzes into a college course and offer directions for future research.