How many endings does IRON NEST have?

Four. All of them branch from the final operation, White Shells, and each grants its own Steam achievement: A City Silent, A City in Celebration, A City Subdued, and The Road Not Taken.

What is the rarest ending in IRON NEST?

The Road Not Taken — "A city spared, and a road no one else will ever walk." — unlocked by 1.2% of owners, the rarest of the four.

Do I have to replay the whole campaign to see another ending?

No. The branch is inside the final operation, White Shells, so replaying that single mission and choosing differently is enough to reach another ending.

Campaign · Operation 15

All four IRON NEST endings

Fourteen operations ask whether you can do the job. White Shells asks whether you will. All four endings branch from that one mission, so you do not need another full campaign to see a different one.

Spoilers below, but only structural ones

This page names each ending, gives its achievement text as Steam publishes it, and describes the shape of the choice. It does not walk through the final mission's dialogue beat by beat. If you have not finished the campaign and want none of it, stop here and go back to the mission list.

A City Silent

Destruction

A city wiped from the map.

You carry out the fire mission as ordered and level the city. The most-unlocked ending, which is what you get by following the last order without deviating from it.

A City in Celebration

Liberation

A city that comes out to meet you.

The city is taken intact and the population greets the advance. Requires you to break with the literal fire order in a specific way rather than simply refusing to fire.

A City Subdued

Submission

A city that kneels, and calls it peace.

The city surrenders under the threat of the guns rather than under them. A demonstration of force without the full mission being carried out.

The Road Not Taken

Walk away

A city spared, and a road no one else will ever walk.

The rarest of the four, unlocked by fewer than two players in a hundred. The city is spared and the Operator’s own story ends somewhere off the map.

A wide view of the empty IRON NEST operator's station: traverse handwheels, gauges and paper tags across the dieselpunk turret interior. — The last order arrives on the same teleprinter as every other order. What you do with it is the only decision the campaign lets you make. Screenshot: IRON NEST: Heavy Turret Simulator.

What the numbers say

Adding the four together gives about 7.6% of owners — and that is an upper bound, because anyone who replays the finale for a second ending is counted twice. So fewer than one owner in twelve has seen any ending at all, which puts the campaign's real difficulty in perspective more sharply than any review score.

The distribution is the interesting part. A City Silent — carrying out the order as given — is the most common. Each ending that requires you to deviate further from the order is progressively rarer, ending with The Road Not Taken at 1.2%. The game makes obedience the path of least resistance and then counts how many people take it.

Getting a different ending

The branch lives inside White Shells itself, not in decisions spread across the campaign, so you can replay that single operation. Practically:

Finish the campaign once and take whichever ending you arrive at honestly — it lands harder that way than if you are optimising for a list.
Then replay White Shells for the others. There is no penalty and no requirement to re-clear the fourteen operations before it.
If you are collecting achievements, note that Pride of Castile — gold on all medals in White Shells — is separate from the endings and is a gunnery challenge, not a narrative one.

Sources

Global achievement stats, Steam — The authoritative mission list and the completion percentages used for the difficulty ranking.

All four IRON NEST endings

What the numbers say

Getting a different ending

Next

Sources