Portal 2 developer Valve has reportedly suggested that the game would be the developer's last single-player game.
The news comes by way of Valve behind-the-scenes chronicler Geoff Keighley who last week published an Apple iPad application called "The final hours of Portal 2".
In the application Keighley said "Portal 2 will probably be Valve’s last game with an isolated single-player experience," saying he heard this directly from Valve boss Gabe Newell.
The comment has already caused concern among gamers with Valve one of the PC platform's leading lights in single player games. Portal 2 managed an impressive Metacritic score of 96 per cent, largely off the back of a fantastic single player experience.
Kotaku's Stephen Totilo called the comment 'striking', speculating what the news might mean for future Valve games: "Would, say, letting a second player control Alyx in Half Life 3 do the trick?"
"Or could Valve be cooking up something less expected?" he concluded.