The document discusses using the ARLearn toolkit to support crisis simulations through mobile serious games. The ARLearn toolkit allows creating augmented reality, mobile, and virtual reality applications to simulate real-world crisis scenarios. It was used in a UNHCR pilot to develop a hostage simulation game where participants took on roles like security officers to make collaborative decisions. The toolkit provides features for serious gaming, rich media, notifications, and modeling application data and dependencies. Lessons from developing these crisis simulations highlighted the need for offline gameplay and more scalable location-based mechanics.