How many copies did Kingdom: Classic sell?

1.1M to 1.7M copies, based on its 23k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Kingdom: Classic make?

Kingdom: Classic is free to play, so there is no copy-sales revenue to estimate.

How big is Kingdom: Classic?

Estimated owners: ≈ 1.1M–1.7M; from 23k reviews (Very Positive)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left Kingdom: Classic out and predicted the genre from its 8 similar games. Every figure here, including Kingdom: Classic's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 11.5M–25.3M

best case 52.4M (War Thunder)

The Building genre

All 8 of your similar games are hits. A big, proven genre for a game like yours.

A hit here: 1,000+ reviews, roughly $150k+ before Steam's cut (a standard indie benchmark).

A typical game

≈ 11.5M–25.3M copies

≈ $86.1M–$186.6M after Steam's cut

from ~374k reviews

Best case

≈ 40.0M–64.9M copies

War Thunder

The genre you'd be entering

Your set: Your set clusters on Building (3 of 8) and Co-op (3 of 8).
The winners: Winners here lead with Simulation + Vehicular Combat, priced around $25.
The era: The games you compared span 2013 to 2022, a genre with a long track record.

Copies and revenue are rough lifetime estimates from the review count.

Similar games

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Bloons TD 6 2018	Est. copies ≈ 11.9M–19.3M SteamSpy 2M–5M	Est. revenue $45.7M–$122.9M after Steam's cut $83.1M–$189.2M before the cut	$13.99	391k reviews Overwhelmingly Positive	Tower DefenseStrategy
Hearts of Iron IV 2016	Est. copies ≈ 14.9M–24.2M SteamSpy 5M–10M	Est. revenue $204.8M–$550.6M after Steam's cut $372.3M–$847.1M before the cut	$49.99	372k reviews Very Positive	StrategyWorld War II
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RimWorld 2018	Est. copies ≈ 7.4M–12.0M SteamSpy 5M–10M	Est. revenue $71.1M–$191.2M after Steam's cut $129.3M–$294.2M before the cut	$34.99	243k reviews Overwhelmingly Positive	Colony SimBase-Building
Geometry Dash 2014	Est. copies ≈ 32.4M–52.6M 1.7x vs typical SteamSpy 5M–10M	Est. revenue $44.4M–$119.5M after Steam's cut $80.8M–$183.9M before the cut	$4.99	623k reviews Very Positive	DifficultMusic
Cities: Skylines 2015	Est. copies ≈ 13.5M–21.9M SteamSpy 10M–20M	Est. revenue $111.2M–$298.9M after Steam's cut $202.2M–$459.9M before the cut	$29.99	291k reviews Very Positive	City Builder Simulation