Alby Hardmode Dungeon is a more advanced version of Alby Dungeon. To enter the dungeon you must go to the old room, in the back of Alby Dungeon's Lobby. Your total level must exceed 250 to enter. Additionally, although a character over total level 250 may 'carry' a lower levelled character into the Hardmode Lobby, they may not enter as a party. Nor may the the player under 250 enter the Hardmode dungeon at all.
The dungeon is very similar to its easier version, because it consists of the same enemies, but stronger. Even though this dungeon is hardmode, it still consits of dungeon difficulties. Alby Hardmode comes in normal, basic, intermediate, and advanced.