Background: Serious games provide a realistic environment in nursing education, a stimulating and experiential learning environment for developing skills necessary for learning, recognizing, analyzing, selecting, and applying information. Methods: This study aims to determine the impact of serious games and standard patient practices developed for nursing education on students’ knowledge levels, satisfaction, self-confidence, critical thinking, and problem-solving skills. A serious game was designed using the educational principles of the diabetes course and developed using the 3D interactive content creation platform UNITY. One group played the game online, whereas another had a face-to-face experience. Both groups completed forms before, after, and 4 weeks later via Google Forms. Results: Quantitative analysis showed significant improvements in knowledge and increases in student satisfaction and confidence in learning in both the serious game and standardized patient groups. The groups had no significant differences in problem-solving and critical-thinking abilities (P > 0.005). Conclusion: Developing advanced clinical proficiencies in nursing students requires an engaging and reliable educational environment. Using serious games and standardized patient simulations in nursing instruction highlights the need for diverse digital teaching tools. Therefore, it is essential to support the professional development of nursing educators in these innovative modalities.