The Last of Us 90-minute making-of documentary available free

Grounded: Making of The Last of Us available via Amazon Video in US

Naughty Dog has released Grounded: Making of the Last of Us for free via Amazon Video in US, the developer announced Tuesday.

As the title suggests, Grounded is a 90-minute video documentary focused on the creation of Naughty Dog's seminal PS3 blockbuster.

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North American residents can watch it for free now via Amazon's video streaming service, while Sony says those outside US will have to wait for the full documentary to be posted via the PlayStation YouTube channel "very soon". A trailer is above.

Naughty Dog last week released The Last of Us: Left Behind, a single-player campaign expansion following Ellie before her encounter with Joel.

In our review of 'Left Behind' we said that "Naughty Dog's next chapter may feel a little too basic and brief for its price tag, but its story still stirs the emotions."

'Left Behind' is the only single-player DLC Naughty Dog has planned for The Last of Us, with the studio's community strategist Eric Monacelli confirming that "there's multiplayer DLC up next. We don't have any more single player DLC planned."