You buy the Warcraft 3: The Frozen Throne for Battle.net
Attention! Requires game Warcraft III: Reign of Chaos
Warcraft III: The Frozen Throne (a portmanteau of warcraft - military craft, frozen throne - the Frozen Throne.) - The official addition to the computer game in the genre of real-time strategy in 2002 Warcraft III: Reign of Chaos.