My husband and I tested the Battle Royale last week. We have not played role-playing games like this before so it was definitely "engaging and challenging"! As we worked through it, it all started to make more sense and we could get into the battle aspect. I really enjoyed the "reaction" aspect--it adds a lot more unpredictability. In a way it reminded me of a super-complex game of chess, with much more varied and interesting characters. I can see that it would be very engaging and challenging in a multi-player/character context. I think you have a lot of wonderful ideas in this game!