Does this statement include game cards bought in the US/Canada attempting to be activated in Europe/Gameforge servers?
No, separate versions of the game, I should have clarified.
KingsIsle prepaid cards (USA, Canada, New Zealand, Australia, Wizard101.com) can be used from anywhere in the world on the North American (KingsIsle) version of the game. These cards only have the KingsIsle logo on them.
Gameforge prepaid cards can only be used on versions of the game hosted by our partners at Gameforge. Their cards should have the Gameforge logo on them, indicating they are only valid on the Gameforge versions of the game.