I have it.
The card code is.......
776FKKFCF2
You can purchase card packs with codes for The 39 Clues. Examples of codes are: G69CTWHC9T, G69CKR3K9T, 223M6DTNX2.
p27v7ao96w
22xf2mjpx2
P47wkjntxp
P29w72kwxp
P2w62x67xp
P29rp379xp
The card that can be used to unlock all 39 Clues Cards is to put in P63726DJXP
the 39 clues most rare card code is P32979TXXP
You have to buy packs of The 39 Clues cards to get the card codes. Card codes can only be entered into one person's card gallery, so you can not use a card code that someone else has already used.
You only can get the card codes by purchasing the The 39 Clues card pack. Codes can only be used once. If the card code has already been entered in your gallery or another player's gallery, it won't work for your gallery.
that's dumb