- Classic Diablo II was released on 29 June 2000. Classic is played if the Lord of Destruction expansion has not been installed; even if it has, Classic characters can be created by unchecking the Expansion Character box when creating a new character.
- Classic characters can be converted to Expansion characters.
- There are separate Ladders for Classic and Classic Hardcore. Titles awarded upon completion of each difficulty also differ:
- Unless stated otherwise, the content of this wiki is only valid for the current patch of the Expansion. Major differences between Classic and Expansion are outlined below.
- Absence of the Rite of Passage quest means characters do not need to be a minimum level to advance to later difficulty levels.
- Player Chance of Blocking is not dependent on character level or Dexterity: it is simply the shield's displayed chance to block (25% Increased Chance of Blocking on Twitchthroe Studded Leather does not apply to shield's displayed chance to block, but it does apply to character screen's displayed chance to block).
- Resistance penalty for player and mercenary is -20 in Nightmare and -50 in Hell. This applies to the following:
- Only the five original classes are available:
- Stash size is 6x4, not 6x8 as in Expansion.
- Cannot equip a second weapon, set of weapons, or weapon and shield, to swap weapons using a key or mouse button.
- The following are not available:
- Sets containing Exceptional or Elite items are not available. Only the following are available:
- Harrogath and its townspeople in Act V are unavailable.
- Mercenaries cannot follow characters between Acts.
- Mercenaries cannot be given items or potions.
- Mercenary screen is not available, so stats cannot be viewed.
- Resistance penalty for mercenary is -20 in Nightmare and -50 in Hell. This applies to the following:
- Barbarian mercenary is unavailable.
- Mercenaries cannot be resurrected.
- Pets cannot follow characters between Acts.
- Champion packs only contain Champions, with no Berserker, Fanatic, Ghostly or Possessed.