Spoilers. The overview is safe. Each ending's details are folded; open only what you want to know.
Overview
| Ending | Report headline | Needs |
|---|---|---|
| Bio-pod | RETRIEVED | A normal run to the end |
| Escape | MORE INFO AT MEETING | An Unchipped run |
| M.E.R.C. | CATASTROPHIC FAILURE | The M.E.R.C. scarf |
| Death | UNRESOLVED | Brain integrity reaches 0 |
The developer describes 10 main layers, a shorter 11th and an optional bonus ending sequence. Official
Reaching the end
Layers 10 and 11 (spoiler)
On layer 10 (WHERE WE MUST REACH) you find the Blue Heart. Getting close to it while standing embeds the cargo in your abdomen, and the way down closes. A high-powered drill pod on that layer only works with the cargo inside you, and takes you to the bottom of layer 11 (CRIMSON ASCENT). Climb to the top of layer 11.
In Endless mode the Blue Heart instead sends you back to layer 2, which is why Endless runs only end in death.
Bio-pod ending
How to get the Bio-pod ending (spoiler)
Reach the top of layer 11 without the M.E.R.C. scarf. You break through to the surface and a pod takes you to the End lab (layer 12). Walk through the door in the lab. In the lab your hunger, thirst, energy, mood and brain health are held at safe minimums, and you can only walk. If your vitals collapse in the lab you also end up in a bio-pod.
Escape ending
How to get the Escape ending (spoiler)
Play the run Unchipped. In the End lab your items and attacks are freed partway through the scientist's dialogue (with the chip they stay locked). Shoot the scientist, then get the cargo out and escape. An achievement exists for escaping without killing a guard.
M.E.R.C. ending
How to get the M.E.R.C. ending (spoiler)
Have the M.E.R.C. scarf anywhere on you when you reach the top of layer 11. The ending starts there instead of the surface. M.E.R.C. runs become available after a bio-pod or escape ending.
What endings unlock
- Characters: any ending as the Experiment unlocks Milky; any ending as Milky unlocks Dune.
- M.E.R.C. runs after a bio-pod or escape ending.
- Menu trinkets on the main menu, one per ending (a game setting can hide them).
- Achievements for each ending, an ending with each character, any ending under 3 hours of run time (In and Out), and escaping without killing a guard. Official
The status report
Every run ends with an MSN-CARGO status report: specimen number and type, depth or time, last recorded mental state (the average of your last 10 mood samples, or Hollow), calories eaten, and CASUALTIES: UNKNOWN plus the number of deaths on this computer. A survived last stand adds ", yet hopeful". You can copy the report to the clipboard.
Questions
How many endings does Casualties: Unknown have?
Three: Bio-pod, Escape and M.E.R.C. Dying is a fourth way for a run to end but it does not count as finishing.
How do you beat Casualties: Unknown?
Descend through layers 1 to 10, get the cargo embedded on layer 10, ride the high-powered drill pod to the bottom of layer 11 and climb to its top. Which ending you get depends on what you do from there.
Is there a secret ending?
The Escape ending is the hidden one for most players because it needs an Unchipped run. The M.E.R.C. ending needs the M.E.R.C. scarf, which is tied to M.E.R.C. runs that open up after a bio-pod or escape ending.
What do endings unlock?
The next character (Milky, then Dune), a main-menu trinket for each ending, M.E.R.C. runs after a bio-pod or escape ending, and Steam achievements for each ending and character.
Sources
- Database Endings wikily.gg, checked 2026-11-11
- Official September progress update Steam news, checked 2026-09-15
- Official Casualties: Unknown launches November 9th Steam news, checked 2026-10-15
- Official Release 1.0 patch notes Steam news, checked 2026-11-09
- Official Global achievement stats Steam Community, checked 2026-11-11