Vintage 1990 Explorer Books – SECRET CODES – With Unpunched Decoder Disk

Vintage 1990 Explorer Books – SECRET CODES – With Unpunched Decoder Disk Learn how to crack and disguise codes, solve puzzles, jokes, riddles, and mini-mysteries — plus this copy still includes the original Secret Decoder Disk (unpopped & intact!), making it an awesome nostalgic find. Details • Softcover – 1990, Explorer Books / Parachute Press • ISBN: 0-440-84154-2 • Decoder Disk still attached + unused • Pages show aging / yellowing typical for age • Minor surface wear to cover corners • Name stamp inside first page Great for: homeschool, classroom library, retro STEM fans, collectors, kids who love puzzles & code-breaking, 90s nostalgia gifting Condition: Vintage used condition – aging / cover wear – disk unpunched