Secret Decoder Set - Case of the Slippery Flippers

Name: Secret Decoder Set - Case of the Slippery Flippers
Brand: Melissa & Doug
SKU: 5536
Price: 6.65 USD
Availability: InStock
Rating: 5.0 (5 reviews)

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$6.65 ~~$8.99~~ In stock

Category: Activity Books

Add some mystery to travel days and test sleuthing skills with this super-cool, portable Secret Decoder mystery and activity book! In The Case of Slippery Flippers, junior detectives will help Gary Gumshoe follow the clues to solve an important case, while doing a variety of activities along the way. Use the handy Seek & Find Lens to spy hidden clues, and the Spy Pen to magically reveal more hints to guide Gary to his final destination; detective tools store conveniently right in the travel-size book cover! All 18 pages of activities include mazes, seek-and-find pictures, puzzles, word scrambles and more. A perfect take-along activity book, the On-the-Go Secret Decoder book helps teach cognitive development and problem solving, and encourages independent play.

SUSTAINABILITY

Create a More Playful Planet

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POWER OF PLAY

Interact & Connect Through Play

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Customer Reviews (5.0 / 5 · 5 reviews)

George W. ★★★★★ Sep 13, 2026

The decoder wheel is the real star here — my daughter figured out the cipher on her own and felt like an actual detective cracking the case. It's small enough to toss in a backpack, which saved us on a rainy vacation afternoon.

Victoria W. ★★★★★ Sep 12, 2026

Kept my 8-year-old busy for the entire three-hour flight, which honestly never happens. The built-in decoder wheel makes her feel like an actual detective, and the flipper mystery kept her guessing till the last page.

Ava ★★★★★ Sep 11, 2026

The decoder wheel is the real star here — my 8-year-old spent a solid hour cracking codes on her own without asking for a screen once. It's slim enough to toss in a backpack, and the mystery actually made her slow down and read carefully.