Available on iOS and Android devices, with Windows support to follow, the app merges both GAME and Gamestation reward cards into one.
The app enables users to keep track of their balance, locate their nearest store and can be presented at the counter with future purchases.
It can be downloaded for free by visiting the official GAME website and following the links, or by searching 'GAME Mobile App' on smartphones.
The launch comes as the official Gamestation website prepares to close down later today (October 29).
Account details will be transferred to GAME.uk.com, as well as all active pre-orders for games, consoles and accessories.
Elite XP reward points will also be transferred to the new GAME reward scheme, although existing Elite cards will still be usable in store.
Announced last month, 122 Gamestation stores will be refitted with the GAME branding by the end of October.
The move will also see the company adopt the best of both brands, with the broad range of games that GAME offers and the community and knowledge Gamestation is well known for, and will also introduce new schemes and in-store offers.
Images: View GAME's midnight launch for FIFA 13:
Copyright: PA Images Scott Heppell