I use unity and ARKit to make this FPS game. It’s about tripod aliens from outer space want to destroy earth, you need to fight and shoot. Although the scenario is silly, I wanna encourage people to play and exercise in real environment. The playing area size can be big as playground. But for my demo, I haven’t figure out how to place my scenes on the ground, it will flip when I touch one surface. For next step, I want to add more elements, like google map API to set my aliens on certain locations.