Outdoor escape game by Outside Escape โ not a physical escape room, but a puzzle route through Arnhem that you play at your own pace with an envelope full of tasks and your phone. Property developer Bernhard van O. exploits Arnhem's housing shortage by buying up more and more buildings and turning them into hotels to increase his power. Players venture into the city to thwart his plans, from Musis Sacrum to Koepelkerk.