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.
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)
The real code for the cards is: 273H7KXMX9
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
P47wkjntxp
P2w62x67xp
I have it. The card code is....... 776FKKFCF2
P29rp379xp
that's dumb
p3gffx4jxp