How many copies did Kingdom: Classic sell?

1.1M to 1.8M 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–1.8M; 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) 11.9M–27.1M

best case 64.7M (War Thunder)

Games like Kingdom: Classic

The middle of these games

≈ 11.9M–27.1M copies

≈ $91.5M–$195.6M after Steam's cut

from ~376k reviews

Only the top fifth of 2019’s Steam releases earned about $34k gross, so plan for that or less.

All 8 of your similar games are hits.

No genre covers most of your similar games. The closest is Building (3 of 8), so the genre you lead with is still undecided.

Of the 416 indie games that passed 1,000 reviews in 2022, 11.8% were novel genre mixes and 88.2% stuck to an established genre. Published indie market research.

Best case: War Thunder at ≈ 49.3M–80.1M copies.

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.
The era: The games you compared span 2013 to 2022, and none of them shipped in the last two years.

How these numbers were worked out

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

Copies come from each game's reviews times a sales-per-review rate that falls with release age, from about 31 for the most recent game here to about 79 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Bloons TD 6 2018	Est. copies ≈ 12.0M–19.5M SteamSpy 2M–5M	Est. revenue $46.1M–$124.0M after Steam's cut $83.8M–$190.7M before the cut	$13.99	394k reviews Overwhelmingly Positive	Tower DefenseStrategy
Hearts of Iron IV 2016	Est. copies ≈ 15.6M–25.4M SteamSpy 5M–10M	Est. revenue $214.5M–$576.7M after Steam's cut $390.0M–$887.2M before the cut	$49.99	375k reviews Very Positive	StrategyWorld War II
War Thunder 2013	Est. copies ≈ 49.3M–80.1M 2.1x vs typical SteamSpy 20M–50M	Est. revenue Free	Free	780k reviews Mostly Positive	Free to PlaySimulation
SCP: Secret Laboratory 2017	Est. copies ≈ 8.0M–13.1M SteamSpy 5M–10M	Est. revenue Free	Free	234k reviews Very Positive	Free to PlayMultiplayer
Raft 2022	Est. copies ≈ 9.4M–15.2M SteamSpy 10M–20M	Est. revenue $51.5M–$138.4M after Steam's cut $93.6M–$213.0M before the cut	$19.99	378k reviews Very Positive	SurvivalMultiplayer
RimWorld 2018	Est. copies ≈ 7.5M–12.1M SteamSpy 5M–10M	Est. revenue $71.8M–$193.1M after Steam's cut $130.6M–$297.1M before the cut	$34.99	246k reviews Overwhelmingly Positive	Colony SimBase-Building
Geometry Dash 2014	Est. copies ≈ 35.7M–58.0M 1.7x vs typical SteamSpy 5M–10M	Est. revenue $49.0M–$131.7M after Steam's cut $89.1M–$202.7M before the cut	$4.99	638k reviews Very Positive	DifficultMusic
Cities: Skylines 2015	Est. copies ≈ 14.2M–23.1M SteamSpy 10M–20M	Est. revenue $117.4M–$315.8M after Steam's cut $213.5M–$485.8M before the cut	$29.99	292k reviews Very Positive	City Builder Simulation