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Ages 6–11⏱ 40 minMess: MEDIUMGrown-up help: LowArt & DesignCoding & Puzzles

Professor O will help you learn: Children invent a symbol code, write a hidden spell in white wax crayon and reveal it with watery paint. They learn how a substitution cipher works and why wax resists water, so the paint only soaks into the bare paper.
⚠️ Cover the table and wear an apron, as watery paint and tea can stain. The tea used for ageing the paper should be cold.
Play through the project step by step, with narration read aloud.
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Steps
Tap any step to play from there — the narration plays inside the player.
Make it your own: Swap code keys with a friend and send each other spooky messages to crack, or try writing with a white candle instead of a crayon.