Naughty Dog isn't quite done with The Last of Us yet. While they recently shipped Left Behind, there's still one more piece of DLC coming to Season Pass holders. As expected, the next update will add new maps, new weapons, and new skills to the online multiplayer mode. However, there's one bit of unexpected campaign content as well: a new difficulty.

"Our final drop in the Season Pass is coming," Naughty Dog writes on their blog. "It is chock full of multiplayer goodness with new maps, new weapons, new skills, and also a brand new difficulty mode for the single player campaign. We'll have more information on it as in-game elements near completion."

Unfortunately, there aren't any clues as to what this new difficulty will be. It's hard to imagine something even more challenging than the game's hardest difficulty--but if we were to guess, that's what we'd bet on.

In addition to today's news, Naughty Dog also released a behind-the-scenes video of the making of Left Behind. Spoilers!