Dark Souls developer From Software has admitted to "technical difficulties" which cause troubling frame-rate issues in its hard-as-nails role-player.

From Software felt out of its depth with the game's huge scope, Dark Souls' creative director Hidetaka Miyazaki revealed to Edge.

"Yes, there were technical difficulties," Miyazaki said. "I don't believe that it's okay to have them, but realistically speaking, it was quite a large-scale game - even in terms of budget and expectations.

"So we're very sorry for the trouble we've caused by our processing errors and bugs from Japan. It was a title that we haven't really experienced in all aspects, so there were areas where we felt our technical side couldn't keep up with the game's scope, like an increasingly growing ache."

Miyazaki considered working on the game "a learning curve", but is unsure whether From Software will ever revisit the Dark Souls universe.

"We don't even know if we'll have another chance. We have the confidence that we can improve from our mistakes this time and create an even better Dark world, but we don't know if the users will forgive us for the mistakes."