Padlocks, mazes and other clever puzzles; these clue ideas will help you create treasure hunt clues that need to be solve, usually by doing something to unlock them or figure them out.
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Combination Locks
A combination lock gives the next clue by using digits found on other clues
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Cryptex
A simple cryptex-style puzzle made from toilet roll tubes.
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Invisible Black Light Writing
Use a special pen to write a clue that can only be read with a “black light”.
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Invisible Lemon Juice Ink Writing
A clue is written in lemon juice, which can only be read by gently warming the paper it is written on.
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Jigsaw Puzzle
The next clue is written down and cut up to form a jigsaw puzzle.
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Letters With Transparent Overlay
A grid of random letters hides a clue, which is revealed by correctly positioning a transparent sheet over the top.
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Locked Card
Using two padlocks, pieces of cardboard are locked together, and must be unlocked to solve the clue.
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Magic Eye
An autostereogram (also knowns as a Magic Eye image) is a pattern of seemingly random dots and splashes inside which is hidden the clue answer.
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Word Search
A clue is hidden in a word search by using the word search’s leftover letters.