I’m working on a campaign that has the player meet a creature pretending to be a sphynx and ask riddles of the players.
The trick is that that creature is both not that smart and thinks he’s very clever. They way past him is to praise him for being so smart that he agrees to let the adventurers go
What are some good ‘bad’ riddles to ask ?
You could have it ask some paradoxes like the well known “A barber shaves all and only those men who do not shave themselves. Does he shave himself?”