Download size

How many GB is Messa Anomaly?

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.

Messa Anomaly is a first-person psychological horror game set in an endlessly shifting museum. Observe each corridor, spot unsettling changes, and choose the correct path. One mistake can send you deeper into a night shift that refuses to end.