World of Warcraft
"World of Warcraft" was first announced by Blizzard at the ECTS trade show in September 2001. Released in 2004, development of the game took roughly 4–5 years, including extensive testing. The 3D graphics in "World of Warcraft" use elements of the proprietary graphics engine originally used in "Warcraft III". The game was designed to be an open environment where players are allowed to do what they please. Quests are optional and were designed to help guide players, allow character development, and to spread characters across different zones to try to avoid what developers called "player collision". The game interface allows players to customize appearance and controls, and to install add-ons and other modifications.
Warcraft III: The Frozen Throne
Warcraft III: The Frozen Throne is the expansion pack for "", a real-time strategy video game by Blizzard Entertainment. It was released worldwide on July 1, 2003 for Microsoft Windows and Mac OS X. "The Frozen Throne" builds upon the story of "Reign of Chaos" and depicts the events after the main game's conclusion. The single-player unfolds from the perspective of two new protagonists—the Night Elf warden Maiev Shadowsong and the Blood Elf prince Kael'Thas—as well as returning protagonist Arthas Menethil. Additionally, the expansion contains Act I of a separate Orc campaign that is independent from the main storyline with Blizzard releasing Acts II and III via patch in December 2003, taking in player feedback of Act I when developing these chapters.