IRON NEST Multiplayer: Is There Co-op?

No, IRON NEST: Heavy Turret Simulator does not have multiplayer. The official FAQ states the game was designed as a fully single-player experience with no native co-op or PvP modes. What actually exists are two separate things: a standalone co-op project the developers have planned for the future, and an unofficial community mod that already lets a crew share one Nest today.

Those three items — the original game’s features, the future standalone project, and the community mod — are easy to confuse, so this page keeps them apart. This page was last checked on August 13, 2026, and future plans can change.

The official answer: single-player by design

The official FAQ is unambiguous: the base game was built as a solo experience. There is no built-in lobby, no co-op campaign toggle, and no versus mode in IRON NEST: Heavy Turret Simulator itself. Every station in the Nest — the tactical map, the guns, the ammunition work — is operated by one player.

If you are deciding whether to buy the game for a co-op night with friends, the honest answer is no. The intended experience is a single gunner running the full fire mission alone, as covered in our IRON NEST guide.

The planned standalone co-op game

The developers have planned a separate, standalone multiplayer game built on the Iron Nest universe and foundations, with co-op as the main focus. This is not an update to the existing game but a distinct project.

Earlier FAQ language suggested 2027 as an ideal rough target, but the developers explicitly described that as uncertain rather than a committed release date. Treat any date you see repeated from that FAQ as aspiration, not a schedule. Until an official announcement lands, watch the IRON NEST roadmap and the Steam FAQ rather than third-party claims.

The unofficial co-op mod

A community mod listed on Nexus Mods adds VR, co-op, and PvP functionality to the existing game. According to the mod description, it supports up to four players sharing one Nest, or two Nests fighting each other in PvP, and it claims flatscreen crossplay. It is unofficial, so none of this is endorsed or supported by the developers.

The technical base is BepInEx 6 IL2CPP x64, and installation requires manually placing dependencies and plugins into the game folder. A tutorial video from a player who tested it with two teammates shows the mod working: the crew assigned stations, called out distances, elevations, and azimuths, and completed fire missions together. The video points to the current release file, IronNestCoop-2.2.0.zip, hosted on the author’s GitHub releases page.

One conflict to note: the mod description lists up to four players in one Nest, while the tutorial video shows the host plus up to four more friends able to join a room. Plan around the smaller number until the author clarifies.

How to install the co-op mod

The tutorial video walks through the process, which matches the manual-install warning on the mod page:

• Register an account on the mod’s download site, then take the free download option.
• Open the downloaded folder and move the two folders and two plugins (everything except the text file) into your game directory. On Steam, right-click the game, choose Manage, then Browse local files to find it.
• Launch the game. A new interface element in the top-left corner of the screen confirms the installation worked.

The author updates the mod over time, so download the newest release from the GitHub releases page rather than an old mirror. The video itself warns the mod may stop working after a game update, so check the release notes after every patch. See our IRON NEST mods page for general modding context.

Crew roles and room setup

Once installed, the host starts the game and receives a room ID, which is different every time the game starts. The host copies the ID and sends it to friends, who paste it into the join field and click join to enter the same room.

The mod turns the Nest’s solo workload into a crew drill, and role assignment is not optional flavor — it is required for stability. The tutorial recommends dividing the stations:

• One player handles the turret handwheel.
• One player handles azimuth.
• One player handles buying ammunition.
• Players crew the left and right guns separately.
• One player works the tactical map.

In the video’s own session, one teammate took the right gun and azimuth, another took the left gun and elevation, and the host handled the firing. The key rule: no two players should interact with the same object. If two players both touch the turret handwheel (rendered as ‘goat horn’ in the video’s translation), it can stop working entirely.

Known risks and limits

The mod author is direct about the state of the project: full co-op missions and sessions above two players were not thoroughly tested. Expect bugs, synchronization problems, and performance risks, especially with a full crew.

Practical precautions from the mod page and the tutorial:

• Every player should run the same game, loader, and mod versions.
• Test first with non-critical save data, not your main campaign.
• If a strange bug hits, everyone should close the game, restart, and rejoin the room. The video creator reports it worked fine in their own testing, but your mileage will vary.

The bottom line on IRON NEST multiplayer: the original game is single-player by design, an official standalone co-op project is planned but not dated, and the community mod is available now but experimental. If you try the mod, treat it like a field test, not a finished feature.