In my kin we sometimes run a riddle-based treasure hunt, where we will position officers around middle-earth with riddles, the answers to which will be the location of the next riddle and so on. Would be good to have something like this. Can be a random event that runs for a day every couple of months. NPCs at each place could have a set number of riddles for them, say, 3 riddles, and will select at random one for the player - creating a number of pathing options to make it more challenging. For us the winner would be the first to complete the chain and reach the end, but in the game we could have some fun rewards at the end (like the master of riddles title) or some cool house items etc.