Released: 2000
Developer/Publisher: Blizzard North for Blizzard Ent.
Platform(s): PC

Before Blizzard completely zombified a nation of nerds with World of Warcraft, they turned the RPG world upside down with what was one of the first adventures geared toward online multiplayer play. Sound familiar? There's a reason it became the fastest-selling video game of all time—at least until a little company called Bungie came along.

A million copies in two weeks may not sound that crazy, but it was enough for a Guinness World Record in 2000.