Dark Souls is not on mobile devices due to touch-screen controls, it has been revealed.

Namco Bandai's director of global strategy for mobile Alex Adjaj said the publisher is interested in a mobile entry, but it has proved "difficult" to convince developer From Software.

"We'd like to bring Dark Souls to mobile, but it's very difficult because the guys at From Software are very much console oriented," he told Digital Spy. "To change their mind about it, it takes quite a while.

"The leads on Dark Souls are saying we don't want to do mobile because the controls would have to be changed, and therefore it won't be Dark Souls anymore.

"At the same time, you have a growth in controllers for mobile. I think it's not an impossible case scenario to see a Dark Souls game coming to mobile at some point.

"But the truth is that the conversations we have with device manufacturers are saying the first control they want is glass, obviously, it's not controller or joystick. They want people to use glass to control the game, so it's a bit difficult, but we're getting there."

Adjaj added that while it "could work incredibly well for mobile", Namco Bandai would have to take into account the tastes of different markets.

"I think there is a need to redesign the way you reroll in the game to make it a bit more casual, so with shorter sessions," he explained.

"But definitely it's something we could bring to mobile in a very successful way.

"It's tricky because mobile has grown to be the biggest platform today, just in terms of install base."

He continued: "There's a very aggressive growth in South East Asia, Japan, South Korea and China. China is becoming a very strong element in our decision-making now.