Objectives, known as quests, are revealed during the progress of the map. Some plot development happens in an occasional cinematic, but most occurs in-game with cutscenes. Unlike previous Blizzard titles, such as Warcraft II or StarCraft, there are no mission briefings in which plot exposition occurs and objectives are announced rather, Warcraft III uses a system of 'seamless quests'.

Additionally, an optional prologue campaign that serves as a tutorial can be played before starting the main campaign. Each campaign is itself divided into chapters and there is a set order in which they have to be played as the story follows the events in these campaigns. Warcraft III 's campaign mode is divided into four campaigns, each featuring a different faction. Additionally, a new 'upkeep' system means that producing units over certain amounts will decrease the amount of gold one can earn, compelling players to focus on playing with a limited number of units to avoid penalties. The first two are required to construct units and buildings, while food restricts the maximum number of units that can be possessed at the same time. There are three main resources that are managed in Warcraft III: gold, lumber, and food. During a game, players must establish settlements to gain resources, defend against others, and train units to explore the map and fight computer controlled foes. Areas no longer in sight range of an allied unit or building are covered with the fog of war, meaning that while the terrain remains visible, changes such as enemy troop movements and building construction are not. The map is initially hidden from view and only becomes visible through exploration. Warcraft III takes place on a map of varying size, such as large plains and fields, with terrain features like rivers, mountains, seas, or cliffs.

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