"Warcraft III: Reign of Chaos" is a real-time strategy (RTS) video game developed and published by Blizzard Entertainment. It was released in 2002 and is set in the high-fantasy world of Warcraft, which is part of Blizzard's Warcraft universe.

Gameplay:
RTS Mechanics: Players control one of four factions (Human Alliance, Orcish Horde, Night Elf Sentinels, and the undead Scourge) in strategic, base-building gameplay. 

Hero System: One of the standout features of Warcraft III is the introduction of hero units. Each faction has unique heroes with powerful abilities that can turn the tide of battles. Heroes gain experience, level up, and can acquire new abilities as they progress.

Campaign: The game includes a single-player campaign for each faction, featuring a compelling storyline that unfolds through missions and cutscenes. The campaigns are interconnected and explore the conflict between the factions and the emergence of a greater threat.