|Original retail box from WarCraft II: Tides of Darkness
The game was originally written for MS-DOS; there was also a Mac OS version of the game. Blizzard also released an expansion pack, developed by Cyberlore Studios, known as Warcraft II: Beyond the Dark Portal on April 30, 1996. Blizzard released Warcraft II: Tides of Darkness for Microsoft Windows, combined with its expansion, in 1999, under the name Warcraft II: Battle.net Edition. Changes made for this release included multiplayer support via Blizzard's online gaming service, Battle.net. There is also a sequel to this, WarCraft III: Reign of Chaos, released in July, 2002. The game has a linear single-player campaign for each side, and a multiplayer option via a LAN or the Internet, using existing or user-created maps.
In WarCraft lore, this is ofter referred to as the Second War.