COMMUNITY • FIELD NOTES
Multiplayer and Mods
Understand Steam’s single-player listing and the limits of a community-made co-op mod.
REVIEWED 13 NOV 2026 / VERSION AND SOURCES BELOW
THE SHORT ANSWER
Steam lists Casualties: Unknown as single-player. Casualties: Together is a separate third-party mod; its author targeted game version 1.0 with mod version 5.5.0 and said that release was not fully tested.
Is multiplayer an official game mode?
The Steam feature list identifies the game as single-player. A community mod is separate from the base game and should not be confused with an officially listed multiplayer mode.
What is Casualties: Together?
Casualties: Together is a third-party community project. Its author’s release notes for mod version 5.5.0 say it targets the full game’s version 1.0 and that testing was limited. Those are the author’s statements, not our own compatibility test.
Does the mod work with game version 1.0.1?
We have not confirmed that from the cited release. Mod version numbers and game version numbers refer to different things. Consult the mod author’s latest release notes for current requirements before making changes to your game.
How do you install or remove it?
We have not tested an installation or removal procedure for the current game build, so this guide does not provide step-by-step instructions. Check the author’s documentation and your game version first.
FOLLOW THE EVIDENCE
Sources & scope
Reviewed 13 November 2026. The developer’s language file was marked version 1.0.1 when checked; its branch may change. We have not independently play-tested every mechanic.
- Casualties: Unknown on Steam ↗Official store
- creaturefeaturelarry · Casualties: Together v5.5.0 ↗Third-party mod author