Blizzard’s just revealed that they are releasing a remake of Diablo inside Diablo III as part of an upcoming patch for the game, letting you revisit some of the bosses of the game and a 16 level dungeon.

The patch, The Darkening of Tristam will be available free to anyone who owns Reaper of Souls on both PC and console. The patch will be live for public test starting next week. Here’s what Blizzard says about the patch:

Celebrate 20 years of Diablo by traveling back into the depths of the Cathedral where it all began in this upcoming Diablo III: Reaper of Souls content update. Get ready to explore a monster-filled dungeon 16 levels deep, and come face to face with the four main bosses from the original game—all with retro touches like special graphics filters and eight-direction character movement.

The patch will come in January, and here’s some screenshots to whet your appetite.