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How many copies did Outer Darkness sell?

Estimated copies sold
≈ 50–81
$41–$111 after Steam's cut $75–$170 before the cut
from 2 reviews (2 user reviews)
Thin evidence: 2 reviews. That range swings on one or two people, so read it as a hint, not a measurement.

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 Outer Darkness out and predicted the genre from its 8 similar games. Every figure here, including Outer Darkness's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 216k–361k
best case 33.1M (The Binding of Isaac: Rebirth)
Games like Outer Darkness

The middle of these games

≈ 216k–361k copies

≈ $1.7M–$2.2M after Steam's cut

from ~6k 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. A breakout hit, far above a typical game.

What it took to get here
About half the games that made it here had over 4k reviews in their first month; the spread ran 2k to 21k.
The genre you'd be entering
Your set
Your set clusters on Action Roguelike (8 of 8) and Rogue-like (5 of 8).
The winners
Winners here lead with Action Roguelike + Rogue-like, priced around $15. The breakout hits carry Replay Value + Pixel Graphics + Great Soundtrack; a typical game here doesn't.
The era
The games you compared span 2014 to 2025, and 2 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 70 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

Curse of the Dead Gods
2021
Est. copies
≈ 228k–371k
1.6x vs typical
SteamSpy 500k–1M
Est. revenue
$1.3M–$3.4M after Steam's cut $2.3M–$5.2M before the cut
$19.99
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The Binding of Isaac: Rebirth
2014
Est. copies
≈ 25.2M–41.0M
77x 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
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Est. copies
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2.2x vs typical
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$883k–$2.4M after Steam's cut $1.6M–$3.7M before the cut
$9.99
13k reviews
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HorrorOnline Co-Op
10 Minutes Till Dawn
2022
Est. copies
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Free
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Shoot 'Em UpAction Roguelike
20 Minutes Till Dawn
2023
Est. copies
≈ 720k–1.2M
4.9x vs typical
SteamSpy 1M–2M
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$989k–$2.7M after Steam's cut $1.8M–$4.1M before the cut
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Action RoguelikeBullet Hell
NECROPOLIS: BRUTAL EDITION
2016
Est. copies
≈ 193k–314k
SteamSpy 200k–500k
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$1.6M–$4.3M after Steam's cut $2.9M–$6.6M before the cut
$29.99
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Souls-likeAction Roguelike
Monstrum
2015
Est. copies
≈ 184k–299k
SteamSpy 200k–500k
Est. revenue
$909k–$2.4M after Steam's cut $1.7M–$3.8M before the cut
$17.99
4k reviews
Very Positive
Mortal Sin
2025
Est. copies
≈ 146k–237k
SteamSpy 200k–500k
Est. revenue
$1.0M–$2.7M after Steam's cut $1.8M–$4.1M before the cut
$24.99
6k reviews
Very Positive
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