Warcraft III: The Frozen Throne is a
real-time strategy computer game by
Blizzard Entertainment. It is the official
expansion pack to
Warcraft III: Reign of Chaos, requiring
Reign of Chaos to play. Released worldwide on July 1, 2003, it includes new units for each race, two new auxiliary races, four campaigns, five neutral heroes (an additional neutral hero was added April 2004 and two more were added in August 2004), the ability to build a shop and other improvements such as the ability to queue upgrades. Sea units were reintroduced; they had been present in
Warcraft II but were absent in
Reign of Chaos. Blizzard Entertainment has released
patches for the game to fix
bugs, extend the scripting system, and balance
multiplayer.