To Check your GameStop gift card balance, all you need to have is your card number and confirmation code with you. The card you receive has the number and its pin is written on the back. The card number is 19-digit long, which helps keep it different for many individual customers. Gamestop Gift Card Balance Gamestop Gift Card Balance Check Gamestop Check Balance Gamestop Gift Card Balance Inquiry Check Gamestop Card Balance Check Gamestop Balance Gamestop Balance Check Check My Gamestop Gift Card Balance Gamestop Balance Check Gamestop Gift Card Balance