How many copies did Spiral Knights sell?

1.5M to 2.5M copies, based on its 24k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Spiral Knights make?

Spiral Knights is free to play, so there is no copy-sales revenue to estimate.

How big is Spiral Knights?

Estimated owners: ≈ 1.5M–2.5M; from 24k 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 Spiral Knights out and predicted the genre from its 8 similar games. Every figure here, including Spiral Knights's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 4.7M–12.7M

best case 33.1M (The Binding of Isaac: Rebirth)

Games like Spiral Knights

The middle of these games

≈ 4.7M–12.7M copies

≈ $34.4M–$91.0M after Steam's cut

from ~193k 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.

Best case: The Binding of Isaac: Rebirth at ≈ 25.2M–41.0M copies, ≈ $104.0M–$279.6M after Steam's cut.

What it took to get here

About half the games that made it here had over 33k reviews in their first month; the spread ran 17k to 102k.

The genre you'd be entering

Your set: Your set clusters on Dungeon Crawler (6 of 8) and Rogue-like (5 of 8).
The winners: Winners here lead with Action Roguelike + Rogue-like, priced around $15.
The era: The games you compared span 2013 to 2024, and 1 of your 8 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
Cult of the Lamb 2022	Est. copies ≈ 3.2M–5.2M SteamSpy 2M–5M	Est. revenue $21.9M–$58.9M after Steam's cut $39.9M–$90.7M before the cut	$24.99	129k reviews Overwhelmingly Positive	Base-BuildingCute
Noita 2020	Est. copies ≈ 2.2M–3.6M SteamSpy 2M–5M	Est. revenue $12.1M–$32.5M after Steam's cut $22.0M–$50.0M before the cut	$19.99	89k reviews Overwhelmingly Positive	PhysicsRogue-like
Path of Exile 2013	Est. copies ≈ 15.8M–25.6M SteamSpy 20M–50M	Est. revenue Free	Free	250k reviews Very Positive	Free to PlayDark Fantasy
Enter the Gungeon 2016	Est. copies ≈ 3.7M–6.1M SteamSpy 2M–5M	Est. revenue $15.4M–$41.4M after Steam's cut $28.0M–$63.6M before the cut	$14.99	90k reviews Overwhelmingly Positive	Bullet HellAction Roguelike
Darkest Dungeon® 2016	Est. copies ≈ 6.7M–10.9M SteamSpy 2M–5M	Est. revenue $46.2M–$124.2M after Steam's cut $84.0M–$191.0M before the cut	$24.99	162k reviews Very Positive	Turn-Based CombatDark Fantasy
Hades 2020	Est. copies ≈ 7.6M–12.4M 1.6x vs typical SteamSpy 5M–10M	Est. revenue $52.5M–$141.0M after Steam's cut $95.4M–$217.0M before the cut	$24.99	308k reviews Overwhelmingly Positive	Action RoguelikeRogue-lite
The Binding of Isaac: Rebirth 2014	Est. copies ≈ 25.2M–41.0M 2.3x vs typical SteamSpy 5M–10M	Est. revenue $104.0M–$279.6M after Steam's cut $189.1M–$430.1M before the cut	$14.99	450k reviews Overwhelmingly Positive	Action RoguelikeRogue-like
Path of Exile 2 2024	Est. copies ≈ 5.6M–9.1M SteamSpy 20M–50M	Est. revenue $45.9M–$123.5M after Steam's cut $83.5M–$190.0M before the cut	$29.99	225k reviews Mostly Positive	Action RPGHack and Slash