You can crack codes, uncover hidden clues, reveal secret messages, and be a super sleuth with this deluxe kit! Featuring 3 unique activity books (Secret Decoder, Seek & Find, and Secret Message), 2 magic-reveal sticker sheets, 2 decoder wheels, 2 color-change markers, an invisible ink marker, and a seek & find lens. Crack the codes and complete the puzzles to solve dozens of mini mysteries! This set includes a 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 with more than 50 unique activities in all. Part of the Melissa & Doug On-the-Go line of travel games and activity books, this set makes a delightful and educational gift for kids ages 7 to 9.