Download size

How many GB is Mission: ISS?

3 GB

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

Leave at least 9 GB free: games need headroom to unpack updates.

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

Take a trip into orbit and experience life on board the International Space Station! In this Emmy-nominated simulation, learn how to move and work in zero-gravity using your controllers. Dock a space capsule, take a spacewalk, and let real NASA astronauts guide you on the ISS through informative videos and images.