Download size

How many GB is Galactic Civilizations IV: Supernova?

22 GB

That is more than the typical Simulator game, which needs about 4 GB.

Leave at least 32 GB free: games need headroom to unpack updates.

The figure is the storage Steam lists as required for this game, not a measured download.

You are the leader of a space-faring civilization at the dawn of the 24th century whose choices for domination are endless: planetary conquest, cultural domination, political alliances, technological supremacy. Your mission is to spread your civilization across the known universe.