Download size

How many GB is Procedure Zero?

15 GB

That is more than the typical Adventure game, which needs about 5 GB.

Leave at least 23 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 uncovered a fraud, so they locked you up. Prisoners are quietly disappearing, and you're next. Sneak past the guards, trade cigarettes for information and take over the prison before they come for you.