Official specs from Steam

Casualties: Unknown system requirements

Minimum and recommended PC specs as listed by the developer on Steam.

Casualties: Unknown release infoSteam page Check other games

Minimum

NoteRequires a 64-bit processor and operating system
OSWindows 10
ProcessorIntel Core i3-8130U 2.20 GHz
Storage500 MB available space
Additional Notes16x9, 16x10, Ultrawide screens supported

Recommended

NoteRequires a 64-bit processor and operating system

FAQ

How big is Casualties: Unknown?

Casualties: Unknown requires 500 MB available space.

Does Casualties: Unknown run on Mac or Steam Deck/Linux?

There is no native macOS version. There is no native Linux build (Proton compatibility may vary).