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
The first three games in the "Warcraft" series, including their expansion packs, were all released on both the PC and Macintosh. All of these games were of the real-time strategy genre. Each game proceeded to carry on the storyline of the previous games, and each introduced new features and content to improve gameplay. "" was the first game in the series to feature play over the internet using Battle.net, although this was not included until a later release of the game. "Warcraft II" was also the first in the series to be re-released as a "Battle Chest", a bundled copy of the game containing both the original and expansion. "" was the first game in the series to feature a Collector's Edition, which all subsequent games have released as well. "Warcraft III" and "World of Warcraft" also have both had "Battle Chests" released for them subsequent to their initial release. The "Battle.net" edition of "Warcraft II" was also the first to introduce the use of CD keys to the series, requiring each user online to have their own copy of the game in order to be able to connect. However, a CD key is not yet required to play via a Local Area Network, although speculation is that future games in the series will do so, as another product in Blizzard Entertainment's portfolio, "", is doing so by removing the option for using LANs altogether, requiring the use of Battle.net.