First rumoured earlier this month, both chains - who are owned by GAME Retail Ltd - will become one single brand, GAME.
The merger will take place throughout September and October, where 122 Gamestation stores will be refitted with the GAME branding.
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.
It will also introduce new schemes and in-store offers. GAME Hunter will allow customers to search the company's entire range of titles, whether they're old, new or pre-owned, and have them delivered to anywhere in the UK.
All stores will be fitted with free WiFi provided by BT, and more interactive fixtures, such as tablets and in-store consoles, will allow consumers to try before they buy.
A new loyalty card scheme will combine those offered by the respective stores, and will be developing new VIP experiences, targeted promotions and community access as part of that.
An app will provide access to the loyalty card offers, as well as a store finder and eventually access to other members of the GAME community.
Finally, GAME plans an improved PC digital download service from its website, offering a broader range of titles.
"The new GAME will combine the best of both brands," said GAME CEO Martyn Gibbs.
"For example, the Gamestation trade-in proposition, 'We Won't Be Beaten On Trade-In', continues under the new unified brand and likewise the passionate and knowledgeable Gamestation store teams stay with us and continue to provide outstanding support and advice for all gamers.
"Our aim is to hold the UK's biggest range of games, gaming gear and exclusive content whilst also ensuring that we are constantly evolving, listening to our customers and adapting our approach to really deliver for them."
He added: "The above initiatives are only a snapshot of a whole host of exciting plans in the pipeline: new titles, formats, partnerships, digital initiatives. We look forward to sharing them with our customers as soon as we can."
GAME has had a turbulent year, with a total of 277 shops and 2,000 jobs lost as a result of the GAME Group's entry into administration. The remaining 333 stores have largely remained untouched.
It recently closed its flagship Oxford Street branch, and redirected consumers to several other nearby locations in central London.
View pictures of the Skyrim launch at GAME's Oxford Street branch below: