The gift card can be used in full or part payment of any product available in GAME stores in the UK. If you want to top-up the amount on the gift card, simply take the card to any GAME store in the UK and tell a member of staff the monetary value you want to add and pay in the usual way.
PLEASE NOTE: When you purchase a GAME Gift Card, GAME will send you a physical card to redeem online or in-store.