Casualties: Unknown WikiUnofficial field guide
Home

Start

Beginner guide

Treat injuries

Medical & triageBleeding & blood lossInternal bleedingInfection & sepsisFractures, dislocations & shrapnelHeart, blood pressure & strokeBrain damage

Survive

Mood & last standFood, water, heat & sleep

The descent

All 11 layersCharactersEndings

Reference

Crafting & INT plannerSkills: INT, STR, RESRun settings & difficultyConsole commandsSaving & save filesAchievementsMods & multiplayerFAQUpdates & patch notes
Official Steam page

Casualties: Unknown FAQ

Short answer

Casualties: Unknown is a hardcore 2D cave-survival simulator by Orsoniks, published by Oro Interactive. Release 1.0 came out on Steam on November 9, 2026 for Windows at a base price of US$22.99. It is single-player, in English and Simplified Chinese, rated Playable on Steam Deck, and has a free demo with the first 5 layers.

Applies to Release 1.0 (Nov 9, 2026) Sources checked

Price and release

$22.99Base price (USD)
Nov 9, 2026Release 1.0, 3pm CET
WindowsWin 10 64-bit, 500 MB

At launch it had a 15% discount, and bundles paired it with Rain World, Palworld, Barotrauma and Abiotic Factor. Official Steam store page.

What kind of game is it?

A slow, side-view survival simulator. You play a genetically engineered test subject sent into an alien pit to recover lost cargo, descending through 11 layers. The body is simulated in detail: blood, heart, oxygen, infection, bones, temperature, mood. Press have compared it to Noita for its procedural caves and brutal physics. Press Press

Steam Deck

Rated Playable by Valve. Players report it running well with a community control layout; the screen is small for reading the health panel. Players

Controller support

None built in. The game needs precise cursor control for minigames and combat. Steam Input with trackpads or gyro is the workaround. Players

Platforms

Windows only on Steam. Linux and Steam Deck through Proton. No Mac, mobile (Android/iOS), Switch, Switch 2, PlayStation or Xbox versions have been announced.

The free demo

Released April 20, 2026 with layers 1 to 5 and played by over 500,000 people. It is frozen at version 7.0.x. Official

How long is it?

A successful run takes many hours: layers take 30 to 80 minutes each. Only about 2% of players have finished a run in under 3 hours (In and Out). With 3 characters, 3 endings, Unchipped and Endless modes there is plenty of replay.

Content warning

The Steam page warns the game touches on depression, violence, dismemberment, drug use and self-harm. The character is anthropomorphic and reacts emotionally to what happens. Settings can censor some mood and pain content. Official

Questions

How much does Casualties: Unknown cost?

US$22.99 base price, with regional pricing. Discounts change, so check the Steam store page for the current price. The 3-hour, 50+ track soundtrack is sold separately and in a bundle.

Is Casualties: Unknown on Steam Deck?

Yes. Steam rates it Playable. There is no native controller support, so use a community Steam Input layout with the trackpads.

Does it have controller support?

No official support. The game leans heavily on the mouse cursor. Steam Input layouts on a Steam Deck or Steam Controller work; plain stick-only controllers are awkward.

Is it on Mac, Linux, mobile, Switch or Xbox?

Officially Windows only. Linux and Steam Deck work through Proton. There is no Mac, Android, iOS, Switch or Xbox version.

Is there a demo?

Yes, a free Steam demo with layers 1 to 5. It stays up but will not be updated past 7.0.x, apart from typo fixes and the new E-PDA texts.

Is it the same as Scav Prototype?

Yes. It started as Scav Prototype on itch.io in December 2024 (over 300,000 downloads) and was renamed for Steam.

Sources

Next file

Beginner guideYour first run: the drop pod, the canteen, bags, light and the first 2 layers.Updates & patch notesDated log of official posts from the reveal to Release 1.0.