Finish Warcraft II: Beyond the Dark Portal

Orcs and humans at sea and in the air; the RTS that made Blizzard.

The 1994 original: two campaigns in Azeroth, mouse-driven, before anybody had heard of the setting.

Arthas becomes the Lich King, and the custom maps become DotA.

Heroes, four races and the custom map that became DotA; Blizzard's RTS peak.

Four more campaigns and a shelf of new artefacts bolted onto Heroes II by Cyberlore in 1997.

The Dark Portal opens onto Outland, blood elves and draenei join, and Illidan waits at the top of the Black Temple.

Northrend, the death knight as a playable class, and Arthas on the Frozen Throne at the top of Icecrown.

Deathwing rips the old world apart, so every zone from 2004 is rebuilt around the damage.