The game's story unfolds primarily through a series of seven playable campaigns, all set upon the continent of Antagarich.

A special version of Heroes III titled Heroes III Complete, which included the original game and both expansion packs, was released in 2000. Heroes Chronicles, a series of short introductory games based on the Heroes III engine, was also released. The game received the expansion packs Heroes of Might and Magic III: Armageddon's Blade and Heroes of Might and Magic III: The Shadow of Death, as well as a fanmade expansion titled Heroes of Might and Magic III: In the Wake of Gods. The conditions for victory vary depending on the map, including conquest of all enemies and towns, collection of a certain amount of a resource, or finding the grail artifact. The hero will progress in experience by engaging in combat with enemy heroes and monsters. The player creates an army by spending resources at one of the eight town types in the game. The gameplay is divided into two parts, tactical overland exploration and a turn-based combat system. The gameplay is very similar to its predecessors in that the player controls a number of heroes that command an army of creatures inspired by myth and legend. The player can choose to play through six different campaigns telling the story, or play in a scenario against computer or human opponents. The game's story is first referenced throughout Might and Magic VI: The Mandate of Heaven and takes place before Might and Magic VII: For Blood and Honor. It is the third installment of the Heroes of Might and Magic series. In 2000, the Dreamcast port was cancelled. An Apple Macintosh port was released by 3DO, and a Linux port was released by Loki Software, both later that year. Heroes of Might and Magic III: The Restoration of Erathia (also known as Heroes III or HoMM3) is a turn-based strategy game developed by New World Computing for Microsoft Windows and released by the 3DO Company in 1999.

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