You can purchase card packs with codes for The 39 Clues. Examples of codes are: G69CTWHC9T, G69CKR3K9T, 223M6DTNX2.
P3tnp2cdxp (all capitals)
p27v7ao96w
The card that can be used to unlock all 39 Clues Cards is to put in P63726DJXP
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.
The real code for the cards is: 273H7KXMX9
p3gffx4jxp
64320P965sP4GHF4M4XP
a wonderful card code is p32979txxp
You can only get the codes by purchasing The 39 Clues Card Pack.
P3tnp2cdxp (all capitals)
P32pdrcnxp and P3RW4FPNXP
p27v7ao96w
22xf2mjpx2
P47wkjntxp
P29w72kwxp
P2w62x67xp
you have to by it