Related Clues:

• Game in wild is a mystery to me
• Exhibitionist's problem
• Hard puzzle
• Difficult problem unravelling ropes
• 'The Imitation Game' machine
• Puzzle formulated in game
• Baffling mystery
• Tangled ropes can present a problem
• Imagine missing one cracking puzzle
• Hard one
• Puzzle in game worked out
• After midnight drink and drug, turned to puzzle
• Puzzle's new meaning missing at core
• Nazi cipher machine broken by the Allies
• 'Why is a raven like a writing-desk?,' e.g