GAME.co.uk has been taken offline as the specialist shop's administrators shut stores on the high street.
A message on GAME.co.uk reconfirmed the appointment of PwC as administrator, which will manage GAME Group's "affairs, business and property as their agents and without personal liability".
It continued: "We are currently reviewing and processing orders placed on this website.
"We apologise for any inconvenience this may cause and we hope to be back up and running very soon."
The message is mirrored on Gamestation.co.uk, which says, "We'll be right back!" and, "See you soon!"
In a statement issued today, GAME said it had taken the decision to enter administration after "careful consideration and ceaseless interrogation of every possible alternative".
"Further to our announcements of 21st March, the Board of GAME has completed its discussions with lenders and third parties without resolution, and has therefore today appointed PWC LLP to act as administrators for the Group," GAME said.
"This decision is taken after careful consideration and ceaseless interrogation of every possible alternative. The Board would like to thank the teams of GAME and Gamestation colleagues around the world for their exemplary dedication, passion and professionalism."
Stores have already begun closing, and staff notified of layoffs. PwC told Eurogamer it hopes to issue a statement on store closures and employees later.
It also declined to name parties interested in a buyout. The Royal Bank of Scotland is said to be leading a bid, with US giant GameStop waiting in the wings.