![]() One of the best places to hide a clue is inside a balloon. Either supply an electric kettle or garment steamer, write the message in a bathroom with a working shower, or use clues to instruct participants to blow directly on the glass. The oil from your finger will transfer to the glass, and the message will remain invisible until the puzzle-solvers add moisture. Speaking of secret messages, you can use your finger for writing a note on a mirror, picture frame, or window. For best results, test read the message beforehand to ensure the letter is legible. Be sure to include a lamp, candle, or flashlight in the room so that puzzle-solvers can decipher the message. ![]() To read the letter, hold the paper up to a light.
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