Mobile augmented reality (AR) games can be engaging learning experiences, leveraging real-world artifacts and locations with a digital overlay of information, narrative, and interactivity. By integrating iBeacons, AR game platforms create a viable means for informal learning organizations (e.g., museums) to create indoor, location-based mobile games. A pilot implementation targeting youth ages 6-12 paired with adults visiting a natural history museum demonstrated that participants were able to locate specific items in galleries densely crowded with artifacts. Participants also found the experience highly engaging, felt that the game provided a lens for closely observing and comparing artifacts, and fostered synthetic thinking across exhibit spaces.