How many copies did Sixth Extinction sell?

446 to 725 copies, based on its 18 Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Sixth Extinction make?

Sixth Extinction is free to play, so there is no copy-sales revenue to estimate.

How big is Sixth Extinction?

Estimated owners: ≈ 446–725; from 18 reviews (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 Sixth Extinction out and predicted the genre from its 8 similar games. Every figure here, including Sixth Extinction's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 570k–1.2M

best case 2.4M (What Remains of Edith Finch)

Games like Sixth Extinction

The middle of these games

≈ 570k–1.2M copies

≈ $3.8M–$6.5M after Steam's cut

from ~22k 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: What Remains of Edith Finch at ≈ 1.8M–2.9M copies, ≈ $10.0M–$26.8M after Steam's cut.

What it took to get here

About half the games that made it here had over 2k reviews in their first month; the spread ran 516 to 3k.

The genre you'd be entering

Your set: Your set clusters on First-Person (5 of 8) and Puzzle (5 of 8).
The winners: Winners here lead with Story Rich + Walking Simulator, priced around $20.
The era: The games you compared span 2015 to 2023, 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 61 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
Superliminal 2020	Est. copies ≈ 843k–1.4M 1.5x vs typical SteamSpy 1M–2M	Est. revenue $4.6M–$12.5M after Steam's cut $8.4M–$19.2M before the cut	$19.99	34k reviews Very Positive	PuzzleFirst-Person
Hue 2016	Est. copies ≈ 472k–767k SteamSpy 500k–1M	Est. revenue $1.9M–$5.2M after Steam's cut $3.5M–$8.0M before the cut	$14.99	11k reviews Very Positive	IndiePuzzle
What Remains of Edith Finch 2017	Est. copies ≈ 1.8M–2.9M 2.4x vs typical SteamSpy 500k–1M	Est. revenue $10.0M–$26.8M after Steam's cut $18.1M–$41.2M before the cut	$19.99	53k reviews Overwhelmingly Positive	Story RichAtmospheric
Bugsnax 2022	Est. copies ≈ 234k–381k SteamSpy 500k–1M	Est. revenue $1.6M–$4.3M after Steam's cut $2.9M–$6.7M before the cut	$24.99	9k reviews Overwhelmingly Positive	Creature CollectorAdventure
The Last Campfire 2021	Est. copies ≈ 506k–822k SteamSpy 500k–1M	Est. revenue $2.1M–$5.6M after Steam's cut $3.8M–$8.6M before the cut	$14.99	20k reviews Overwhelmingly Positive	PuzzleAdventure
The Beginner's Guide 2015	Est. copies ≈ 1.1M–1.9M SteamSpy 500k–1M	Est. revenue $3.2M–$8.5M after Steam's cut $5.7M–$13.0M before the cut	$9.99	23k reviews Very Positive	Story Rich Walking Simulator
There Is No Game: Wrong Dimension 2020	Est. copies ≈ 644k–1.0M SteamSpy 500k–1M	Est. revenue $2.3M–$6.2M after Steam's cut $4.2M–$9.5M before the cut	$12.99	26k reviews Overwhelmingly Positive	IndieAdventure
Viewfinder 2023	Est. copies ≈ 322k–523k SteamSpy 200k–500k	Est. revenue $2.2M–$5.9M after Steam's cut $4.0M–$9.1M before the cut	$24.99	13k reviews Very Positive	Puzzle-PlatformerPuzzle