Related Clues:
- Too complex to solve
- Cryptic, mysterious
- Puzzling, obscure
- Mysterious like Mona Lisa's smile
- Mysterious or puzzling
- Mysterious or puzzling, like Mona Lisa's smile
- Obscure, puzzling
- Tree trunk with hard masses - it's problematic
- Mysterious, puzzling
- It's a mystery what is the magnet ICI has
- The magic I met is so puzzling
- Game in a puzzling muddle with a tic
- Gnarled, as a tree trunk
- Puzzling about giant mice
- Wood is often hard