Limbo developer Playdead's next project "will take at least three and a half years", so says the Danish studio's co-founder Dino Patti.
"A good game takes time," he explained to Edge.
There's no word on exactly what form the title will take, though business partner Arnt Jensen added that it's being built with the Unity Engine rather than its own in-house tech.
"It's like having a double product, doing both engine and game. And our next project is a little more ambitious than Limbo so there are a lot of things we don't want to make from the beginning."
Limbo, which released on XBLA last summer, before heading to PSN and Steam last month, won universal acclaim for its distinctive visuals, dark humour and clever puzzle-platforming. Refer back to Eurogamer's 9/10 Limbo review for more.