Blizzard Entertainment is marking the 20th anniversary of the original Diablo by recreating it inside Diablo 3, the studio announced today during the BlizzCon 2016 opening ceremony.
Diablo will arrive in an upcoming content update for Diablo 3: Reaper of Souls called The Darkening of Tristram that will "send you back into the depths of the Cathedral," said Frank Pearce, Blizzard's chief development officer. Darkening of Tristram will offer a dungeon 16 levels deep in which you will face off against the four main bosses from Diablo.
Blizzard is putting an appropriately old-school presentation on Diablo in Diablo 3. The game will come with visual filters to make it look pixelated and grainy — "we call it 'glorious retrovision,'" said Pearce. In addition, the character movement will be locked to eight directions, just like in the original Diablo.
"It will be a proper old-school Diablo experience," said Pearce, and while it will be available to all current characters, Pearce recommended trying it with a fresh character.
The Darkening of Tristram will be available in Diablo 3's Public Test Realm next week. The original Diablo was released Dec. 31, 1996.
Update: The Darkening of Tristram will be a free content update for Diablo 3: Reaper of Souls, so you will need to have the expansion in order to play Diablo in the game.