You can't enter them manually. But, check out 39clues.wikia.com/wiki/Card_combos
~James the Janus
Check out this reusable card code! P3GJW7JEXP
P23hrfxfxp
Yes
madrigals
James Cahill is not a LucianHope that helps. ^_^Someone else here: what are the book codes for?
William McIntyre's dog in the 39 Clues book series is named Saladin. Saladin plays a significant role as a companion to William and the Cahill siblings throughout their adventures.
P3NCKRWNXP unused
P23hrfxfxp
CROATIA
LUCIANCLUE
Tomas
Here it is:p24nxknmxp
universe.skylanders.com/play