Gamification—the application of game elements in non-gaming contexts—has emerged as a powerful tool in tourism marketing. This study examines how gamification influences tourist behavior, enhances destination marketing, strengthens brand loyalty, and increases user engagement. Using a mixed-method approach, including surveys (N = 1,200 tourists), interviews with 40 tourism marketing professionals, and analysis of 18 global gamification cases, the research explores the psychological foundations and strategic applications of gamified tourism campaigns. Results show that gamification increases engagement by 60–120%, enhances tourist satisfaction, and significantly strengthens repeat visitation intention. However, challenges include cultural differences, technology cost, design complexity, and user motivation variability. The study concludes with practical guidelines for using gamification as an innovative tourism marketing strategy