Riddle Time: Blue on the inside, red on the outside? What could it be?
Puzzle time. I can imagine a couple of the numbers missing and needing to use the keys to unlock the secret chamber or chest.
Riddle Time: It’s a journey whose path depends, on another's vision of where it ends. Obviously many correct answers, but which would fit in your fantasy campaign?
Guard Puzzle from Brilliant.org. Not quite sure how this would fit into a TTRPG adventure, but it's a neat little conundrum. I suppose they might be magic sensors or golems?