Download size

How many GB is Project Horizon?

4 GB

Leave at least 10 GB free: games need headroom to unpack updates.

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

Project Horizon is a 1-4 player co-op first-person spaceship simulator where the entire crew needs to work together to carefully maintain the nuclear reactor, take up arms against enemy ships, and repair every leak and faulty electrical panel to survive.