More ways to play
Choose the official download that fits your run.
Watch before you descend
Two videos about the game, with direct YouTube links.
The cargo is down there.
Your odds are worse.
Casualties: Unknown is an unforgiving 2D cave exploration survival simulator by Orsoniks. As an expendable test subject, you are sent beneath an alien planet to recover lost cargo. Hostile environments, scarce resources, and permanent death make every decision count.
The free Steam demo includes five layers, detailed limb and cardiovascular damage, crafting, character traits, and hundreds of items to discover. The full game launched on 9 November 2026 with eleven layers and three playable characters. Surviving means watching blood loss, infection, consciousness and mood as carefully as the route ahead.
Compare the official downloads ↗
Read the field notes
Your first descent
Start with the tutorial, learn the survival loop, and make fewer irreversible mistakes.
Read guide ↗FIELD NOTE / MEDICAL GUIDEBleeding, wounds & survival
A practical way to think about the demo’s limb and cardiovascular systems.
Read guide ↗FIELD NOTE / CRAFTING GUIDECraft for the next hazard
How to turn scavenged resources into survival choices without guessing recipes.
Read guide ↗FIELD NOTE / CAVE LAYERSFive layers in the demo
What the official listing confirms about the descent and how to prepare.
Read guide ↗How to start
Install the demo
Open the official Steam page and install the free Windows demo.
Play the tutorial
The developer recommends it before your first run. Learn the core systems while the stakes are low.
Descend with care
Inspect hazards, gather supplies, craft useful tools, and treat injuries before they spiral.
Learn the controls in-game
The official itch.io page recommends playing the tutorial before a run. Use it to learn movement, inventory, crafting and the health interface, then check the current build’s settings for your key bindings. Controls can change between the itch.io prototype and Steam demo, so a fixed key chart here would be unreliable.
Follow the first-run checklist ↗Frequently asked questions
Can I play Casualties: Unknown online here?
Not yet. The supplied official pages offer downloadable PC versions, and no verified browser iframe URL has been provided. Use the Steam demo or itch.io prototype links above.
Is the demo free?
Yes. Steam lists a free demo with five playable cave layers. The itch.io prototype is offered as a name-your-own-price download.
Is there multiplayer?
The official Steam demo is listed as single-player. Community modifications are separate from official support.
What should I learn first?
Start with the in-game tutorial. Then learn to inspect injuries, manage blood loss and infection, and craft tools without wasting critical supplies.
Is the full game out?
Yes. The official Steam listing gives 9 November 2026 as the full game’s release date. It has eleven layers and three playable characters, while the free demo has five layers.
Does it run on mobile?
The Steam demo lists Windows 10 as its minimum operating system. The provided official sources do not confirm a mobile release.