You have to play all the missions and get all the books and the card packs
yes
hamburger
the boy in the 39 clues books is called Dan cahill and the girl is called Amy Chaill
only 39 clues... hence no 41st clue
you have to read all the books of th3 39 clues which you can buy in schoolastic or other places, but the cheat code is P4G4MPNNXP
Well, if you have all the mission clues you have to buy the books and card packs to get the rest. And you need to solve your cards puzzles on line.
Buying Books
There are 11 original books in "The 39 Clues" series that are possible to get in hardback. These books are written by various authors and follow the story of two siblings in a worldwide hunt for 39 clues that will determine the family's power and fortune.
Read the books. Collect the cards. Play the game.
You have to add the cards of the books and card packs. Card combos unlock clues. Complete the missions to unlock more clues. When you have all the card combos complete and you have played all missions you will have all the 39 clues. Don't use the replicator cards if not necessary. Use them when you need to unlock a card when it has not been unlocked even after you have added all the cards of the books and card pack.
I played that game. You have to solve the clues online. But if you want the hand held card. You have to go and buy the 39 clues books. There should be 10 books.