How Many Layers Are in Casualties: Unknown?

How many layers are in Casualties: Unknown?

Eleven. The official Steam page says your captors task you with retrieving cargo across 11 layers of a hostile alien cave system. The same feature bullet repeats 11 layers with distinct challenges. The demo on Steam is a separate app that sources checked on 2026-11-10 describe as limited to the first five layers on frozen demo build 7.0.1, so counting layers in the demo is not the same as the paid game.

What are all eleven layers in order?

The table below is the 1.0 layer order cross-checked between the Steam marketing copy (eleven layers total) and community layer lists on 2026-11-10. Individual biome mechanics are not verified here—only names and sequence. For early survival notes, see Gravel Lands and Deeper Gravel Lands.

Depth markers appear in official screenshots (for example 435 m and 1486 m in store media), but those numbers are not tied to a layer index in public materials we checked—treat depth readouts as run progress signals, not as a fixed layer map.

How does the demo compare to the full eleven layers?

If you are deciding whether to buy after the demo, pair this list with the beginner guide and system requirements. Medical pressure rises as you descend; the medical guide explains triage when injuries stack on longer dives.

What should you do after you know the layer count?

Use the count to plan retreats and supply, not to rush depth. Official copy emphasizes adaptation—each layer brings its own challenges—and the simulation punishes bleeding, infection, and mood collapse before you notice you are out of time. When you are ready for mechanics beyond names, branch into crafting recipes and the two starter layer pages linked above rather than guessing hazards we have not verified per layer.

Sources checked

• https://store.steampowered.com/app/4576490/Casualties_Unknown/ (11 layers in description and feature list; demo app link)
• https://store.steampowered.com/app/4576510/ (demo storefront listing)
• https://casualtiesunknown.miraheze.org/wiki/Layers (layer name order — community-reported)

Last checked 2026-11-10 against the sources above, game version 1.0.

Screenshots and trailer frames: official Steam store page and trailers, © Orsoniks / Oro Interactive.