Shhh — it's classified. Melissa & Doug's Secret Decoder Activity Set hands your young sleuth a bundle of spy-worthy puzzles, hidden messages, and codes just waiting to be cracked. Reveal invisible clues, solve tricky mysteries, and write your own secret messages to swap with fellow agents.

Packed with brain-teasing activities, this set builds problem-solving, logic, and reading skills while kids think they're just having covert fun. It's the kind of screen-free challenge that keeps curious minds hooked for hours.

Perfect for spy-party favors, rainy afternoons, and travel, it turns quiet time into a full-blown secret mission.