Casualties: Unknown is out on Steam: the cave survival sim with simulated blood and limbs, price, launch discount until Nov. 23, PC specs

[video]https://www.youtube.com/watch?v=-Sd7HIk41Us[/video]

Video: “Casualties: Unknown | Official Release Trailer”, official Oro Interactive (publisher) YouTube channel, published November 9, 2026 at 2:55 p.m. Paris time, 1 min 33 s. https://www.youtube.com/watch?v=-Sd7HIk41Us

Casualties: Unknown, the hardcore cave-exploration survival simulator made by solo developer Orsoniks and published by Oro Interactive, is out now on Steam for Windows PC. It launched on Monday, November 9, 2026 at 3 p.m. Paris time (3pm CET, as announced by the developer). According to the publisher, the free demo released in April attracted more than 500,000 players and the game passed 400,000 Steam wishlists before launch. On November 10 at about 12:15 p.m. Paris time, the Steam page showed an “Overwhelmingly Positive” rating, with 97% of 1,191 user reviews positive.

Per the official Steam page, you play one of thousands of test subjects sent by your captors to recover lost cargo deep inside a foreign planet. It is a 2D game where you descend through layers of caves, scavenge, craft tools and try not to die. The twist is the body simulation: limbs and the cardiovascular system are fully simulated, so a deep cut keeps bleeding until you bandage it, a dirty wound can become infected, and losing too much blood makes you black out. Your character’s mood matters too: fear and despair make survival harder.

    • Twice the depth: the demo covered layers 1 to 5; the full game has 10 main layers plus a shorter 11th layer (layers 6-11 are new). 

    • 3 playable characters with their own stats and playstyles. 

    • Multiple endings (three, per the developer), plus an optional bonus ending mentioned by the publisher. 

    • 3 tiers of prostheses to replace lost limbs; the top tier is an upgrade over the original limb. 

    • 300+ items, crafting, character traits (Intelligence, Strength, Resilience), adjustable loot and danger settings, an Endless mode and 40 achievements. 

The demo stays available on Steam but will not be updated (only typo fixes), and demo progress is not mentioned as carrying over. The 1.0 patch notes list many balance changes, for example a less punishing amputation minigame, more controllable guns and an option to switch measurement units.

    • Price on the French Steam store on November 10: €18.69 instead of €21.99 (-15%, introductory offer ending November 23, 2026; Steam does not show the exact time). The press release quotes $22.99 / €22.99 before discount; Steam applies regional pricing, so check the price shown in your store. 

    • The official soundtrack (more than 3 hours, over 50 tracks) is sold separately on Steam: https://store.steampowered.com/app/5326310 

    • The developer also mentions bundles with Rain World, Palworld, Barotrauma and Abiotic Factor. 

    • Minimum (Steam page): 64-bit Windows 10, Intel Core i3-8130U 2.20 GHz, 500 MB of storage; 16:9, 16:10 and ultrawide screens supported. No recommended specs beyond a 64-bit system are listed. 

    • Platforms: Windows PC only (no Mac or Linux version listed, no console version announced). 

    • Languages: English and Simplified Chinese only. No French at launch. 

    • Content warning from the developer: the game touches on depression, violence, dismemberment, drug use and self-harm. Player discretion is advised. A “censor pain” option exists in the settings (mentioned in the 1.0 patch notes). 

Casualties: Unknown started as a small personal project by Orsoniks, a designer, programmer, composer and artist. Free early versions on itch.io (first released December 31, 2024) passed 300,000 downloads according to the developer, before the Steam demo in April 2026 and the full release after almost three years of development. Bugs can be reported on the official Discord linked from the Steam announcement.

Sources (read November 10, 2026, about 12:15 p.m. Paris time):

Official Steam store page, “Casualties: Unknown” (Orsoniks / Oro Interactive), read November 10, 2026: https://store.steampowered.com/app/4576490/Casualties_Unknown/

Official Steam announcement “Casualties: Unknown is out now!”, Orsoniks, November 9, 2026: https://store.steampowered.com/news/app/4576490/view/683018108282077539

Official “Release 1.0 Patchnotes”, Orsoniks, Steam, November 9, 2026: https://store.steampowered.com/news/app/4576490/view/683018108282077545

Official Steam announcement “Casualties: Unknown Launches November 9th”, Orsoniks, October 15, 2026: https://store.steampowered.com/news/app/4576490/view/705533459844566506

Official press release, Oro Interactive, “Casualties: Unknown is OUT NOW, with 500,000 demo players”, November 9, 2026 (distributed via Games Press): https://www.gamespress.com/Casualties-Unknown-is-OUT-NOW-with-500000-demo-players-Cave-exploratio

Official video “Casualties: Unknown | Official Release Trailer”, Oro Interactive YouTube channel, November 9, 2026: https://www.youtube.com/watch?v=-Sd7HIk41Us

Image: official key art from the release trailer thumbnail, © Orsoniks / Oro Interactive. Original file: https://i.ytimg.com/vi/-Sd7HIk41Us/maxresdefault.jpg