What is the hidden code for card 4 in The 39 Clues?

Answer 1

In "The 39 Clues," the hidden code for card 4 can be found by deciphering the clues provided in the books and accompanying materials. Each card typically contains a combination of letters and numbers that correlate with specific missions or challenges in the series. To unlock the code, readers often need to piece together information from various sources within the story. It's best to refer to the specific card or book for the exact details.