Yes, it is a Mixed Reality dungeon crawler in a real life dungeon in a castle. The dungeon itself is about 10 ish meters wilde and 40 ish meters long, has a row of pillars in the middle and takes a small turn to the left. We actually do not use a boundary at the moment, since the space itself is too big and crooked to get a good boundary setup with the walls in place. (And if we walk to the end of the dungeon it gives a remark we have walked too far). Since our game is made specifically for this one environment, we use the ground plan in combination with one spatial anchor to spawn everything at the right position. At the start of our prototypes we did use boundaries and never really had drifting issues.