Puzzle adventure is a widely popular genre of entertainment games. This paper presents a wide-field outdoor puzzle game system, Kaidan, which is based on augmented reality (AR) technology. In this system, users can move freely throughout a college campus, and are prompted by mobile device instructions to locate clues, solve puzzles and ultimately complete the game. The puzzle clues in the system are delivered through AR technology, GPS position navigation and sensor-based interactive technology, and are also associated with the environment of real scene, which together enhance the level of immersion of the game. The paper also describes a user study, based on actual feedback data from users. Finally, the augmented reality technology enhancing users's experience of the outdoor puzzle game is analyzed in detail.