Download size

How many GB is BastionOS?

0.2 GB

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

Leave at least 6 GB free: games need headroom to unpack updates.

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

BastionOS is a chill active incremental game where you command a military terminal to stack ludicrous weapons and upgrades onto a lone tower facing an endless machine army. Destroy a gigantic evolving horde, get destroyed, unlock new tech, repeat, and get strong enough to survive the next level.