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 players who have it: ≈ 446–725; from 18 reviews (Positive)

Copies are estimated from the public review count, adjusted for release year, and cross-checked against SteamSpy's own estimate.

Did the prediction match what actually happened?

We hid Sixth Extinction and predicted how it would do from its 8 similar games. Every figure here, including Sixth Extinction's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 574k–1.2M

best case 2.4M (What Remains of Edith Finch)

Games like Sixth Extinction

A typical game among these

≈ 574k–1.2M copies

≈ $3.8M–$6.5M after Steam's cut

from ~22k reviews

Only the top fifth of 2019's Steam releases earned $34k or more before Steam's cut, so plan for that or less.

All 8 of the similar games are hits.

Best case: What Remains of Edith Finch at ≈ 1.8M–3.0M copies, ≈ $10.1M–$27.2M after Steam's cut.

What their first month looked like

About half the games that made it here had over 2k reviews in their first month; the range was 515 to 3k.

The genre you'd be entering

These games: The similar games share First-Person (5 of 8) and Puzzle (5 of 8).
The winners: Winners here lead with Story Rich + Walking Simulator, priced around $20.
When they shipped: The similar games 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 ≈ 848k–1.4M 1.5x vs typical SteamSpy 1M–2M	Est. revenue $4.7M–$12.5M after Steam's cut $8.5M–$19.3M before Steam's cut	$19.99	34k reviews Very Positive	PuzzleFirst-Person
Hue 2016	Est. copies ≈ 474k–770k SteamSpy 500k–1M	Est. revenue $2.0M–$5.3M after Steam's cut $3.6M–$8.1M before Steam's cut	$14.99	11k reviews Very Positive	IndiePuzzle
What Remains of Edith Finch 2017	Est. copies ≈ 1.8M–3.0M 2.4x vs typical SteamSpy 500k–1M	Est. revenue $10.1M–$27.2M after Steam's cut $18.4M–$41.8M before Steam's cut	$19.99	53k reviews Overwhelmingly Positive	Story RichAtmospheric
Bugsnax 2022	Est. copies ≈ 237k–385k SteamSpy 500k–1M	Est. revenue $1.6M–$4.4M after Steam's cut $3.0M–$6.7M before Steam's cut	$24.99	10k reviews Overwhelmingly Positive	Creature CollectorAdventure
The Last Campfire 2021	Est. copies ≈ 516k–839k SteamSpy 500k–1M	Est. revenue $2.1M–$5.7M after Steam's cut $3.9M–$8.8M before Steam's cut	$14.99	21k reviews Overwhelmingly Positive	PuzzleAdventure
The Beginner's Guide 2015	Est. copies ≈ 1.2M–1.9M SteamSpy 500k–1M	Est. revenue $3.2M–$8.5M after Steam's cut $5.8M–$13.1M before Steam's cut	$9.99	24k reviews Very Positive	Story Rich Walking Simulator
There Is No Game: Wrong Dimension 2020	Est. copies ≈ 648k–1.1M SteamSpy 500k–1M	Est. revenue $2.3M–$6.2M after Steam's cut $4.2M–$9.6M before Steam's cut	$12.99	26k reviews Overwhelmingly Positive	IndieAdventure
Viewfinder 2023	Est. copies ≈ 330k–536k SteamSpy 200k–500k	Est. revenue $2.3M–$6.1M after Steam's cut $4.1M–$9.4M before Steam's cut	$24.99	13k reviews Very Positive	Puzzle-PlatformerPuzzle