The Dungeon is 16 levels deep, divided into 4 sections as the original game is (Catacombs are replaced with nephalem ruins, Caves with mines and Hell with Halls of Agony visuals). Those monsters, which do not have a direct equivalent in D3, use graphics of the closest possible match (for instance, Winged Demons use graphics of Winged Talus). Some of them do have their old abilities, and some do not. Monsters in Anniversary Dungeon are the same as those in D1, but use the graphical assets from D3 with only slight recolor. They always drop Magic Items of top tier from Diablo I, for example, King's Sword of Haste, Archangel's Staff of Apocalypse or Godly Plate of the Whale (though at maximum level, these items are of little usefulness). In addition, every single Unique Monster from Diablo I can be found and killed, though they are mostly just buffed-up regular monsters with no affixes (and only a few have a single affix at their disposal). Returning Boss Fights are The Butcher, Skeleton King, Arch-Bishop Lazarus and The Dark Lord ( Diablo) himself. The Anniversary Dungeon recreates most of the events, monsters, and levels of the original Diablo inside gameplay of Diablo III.

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