This year marks the 20th anniversary of Blizzard’s dungeon crawler Diablo, and to celebrate, Blizzard is remaking the classic game — inside of Diablo 3.

The original Diablo returns in the form of a new anniversary update called "Darkening of Tristram,” which brings the graphics, gameplay, and style of the first game to Diablo 3. The update will include a 16-level dungeon with the four main bosses from Diablo, and will limit players to the 8-degree-of-freedom movement along with applying an old-school filter to invoke the original Diablo atmosphere. The “Darkening of Tristram” will be free when it releases, and can be played as early as next week in the Diablo 3 Public Test Realm server.

Additionally, Blizzard also announced a second update, the Rise of the Necromancer Pack, planned for next year, that brings a new character class — the Necromancer — to Diablo 3. It’s a paid add-on that will require both the base Diablo 3 game and Reaper of Souls expansion to use, and will serve as a “reimagining of the classic Diablo 2 class,” with abilities based around raising the dead. However, besides the general 2017 date, no price or release information has been announced yet.