You can start combining cards on the 39 clues after book four comes out. The "my cards" page will be up graded. The cards that you have already will combine automatically, just go to my clues and you will have new clues. To know if you have a card that can combine in the series two, look in the top left corner. If you see a key your card can combine with other cards with a key with the same symbol such As an alien or Africa. Ask more questions because I know the answers, but I will not give away card codes or puzzle answers.
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Aloe. It is also one of the 39 Clues.
The card that can be used to unlock all 39 Clues Cards is to put in P63726DJXP
You can purchase card packs with codes for The 39 Clues. Examples of codes are: G69CTWHC9T, G69CKR3K9T, 223M6DTNX2.
The 39 Clues Card 118 Puzzle: Question: Which numbered piece goes in slot C? Answer: 2
You have to play all the missions and get all the books and the card packs