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 card codes for Book 6: In Too Deep are unreusable
You can purchase card packs with codes for The 39 Clues. Examples of codes are: G69CTWHC9T, G69CKR3K9T, 223M6DTNX2.
p27v7ao96w
The card that can be used to unlock all 39 Clues Cards is to put in P63726DJXP
P3tnp2cdxp (all capitals)
well heres one code P3KPMWPGXP
You can purchase card packs with codes for The 39 Clues. Examples of codes are: G69CTWHC9T, G69CKR3K9T, 223M6DTNX2.
the 39 clues most rare card code is P32979TXXP
p27v7ao96w
The card that can be used to unlock all 39 Clues Cards is to put in P63726DJXP
22xf2mjpx2
P29w72kwxp
P2w62x67xp
P47wkjntxp
I have it. The card code is....... 776FKKFCF2
P29rp379xp
P4jdrxxhxp
P66gttnpxp