Porting The Last of Us to PlayStation 4 was “hell” says Naughty Dog creative director Neil Druckmann.

Speaking with Edge, Druckmann said the game was so deeply optimised for PlayStation 3 that getting it across to new-gen hardware was a nightmare.

"I wish we had a button that was like ‘Turn On PS4 Mode’, but no," Druckmann said.

"We expected it to be hell, and it was hell. Just getting an image onscreen, even an inferior one with the shadows broken, lighting broken and with it crashing every 30 seconds…that took a long time.

“These engineers are some of the best in the industry and they optimised the game so much for the PS3’s SPUs specifically,” he added.

“It was optimised on a binary level, but after shifting those things over, you have to go back to the high level, make sure the systems are intact, and optimise it again. I can’t describe how difficult a task that is.”

The PlayStation 4 version runs at 1080p and 60 frames per second and is "a straightforward port" according to Drunkmann.

"Then there are some ideas of how to use the touchpad that we’ll play with and see if it’s worth it,” he said.

“Mostly, we don’t want to mess with the experience too much, and we don’t want to deviate from what made The Last Of Us so great."

Remastered will also include a director’s commentary for all in-game cinematics featuring Druckmann, game director Bruce Straley, and voice actors Troy Baker and Ashley Johnson (Joel and Ellie).

The game’s story expansion Left Behind will be bundled in, as will the Abandoned Territories and Reclaimed Territories multiplayer map packs.

Earlier this month, Druckmann told Edge that the game is almost too big to fit on a Blu-Ray disc.

The Last of Us Remastered will be out in the second half of this year.