Melissa & Doug On the Go Secret Decoder Deluxe Activity Set and Super Sleuth Toy Includes Secret Decoder Game Book, Seek & Find Game Book, Secret Message Activity Pad, and magic-reveal sticker sheets Use the tools to decode, write, and reveal invisible messages More than 50 unique activities in all Crack codes and complete puzzles to solve dozens of mini mysteries Part of the Melissa & Doug On-the-Go line of travel games and activity books