Download size

How many GB is Open Door?

12 GB

That is more than the typical Puzzle game, which needs about 3 GB.

Leave at least 20 GB free: games need headroom to unpack updates.

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

A science experiment in which no one survives, in a first-person survival horror game made by one developer As a random person who is trapped, try to get out and find out what's going on in this godforsaken place