How many copies did SAS: Zombie Assault 4 sell?

334k to 543k copies, based on its 10k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did SAS: Zombie Assault 4 make?

SAS: Zombie Assault 4 is free to play, so there is no copy-sales revenue to estimate.

How big is SAS: Zombie Assault 4?

Estimated players who have it: ≈ 334k–543k; from 10k reviews (Very 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 SAS: Zombie Assault 4 and predicted how it would do from its 8 similar games. Every figure here, including SAS: Zombie Assault 4's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 7.8M–15.5M

best case 40.7M (Wallpaper Engine)

Games like SAS: Zombie Assault 4

A typical game among these

≈ 7.8M–15.5M copies

≈ $78.4M–$93.6M after Steam's cut

from ~213k 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: Wallpaper Engine at ≈ 31.0M–50.3M copies, ≈ $42.5M–$114.3M after Steam's cut.

The genre you'd be entering

These games: The similar games share FPS (6 of 8) and Open World (4 of 8).
The winners: Winners here lead with Mature + Utilities, priced around $5.
When they shipped: None of the similar games shipped in the last two years; the newest is from 2020. That says more about which games were found than about the market.

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 52 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
theHunter: Call of the Wild™ 2017	Est. copies ≈ 7.0M–11.4M SteamSpy 5M–10M	Est. revenue Free	Free	203k reviews Very Positive	HuntingOpen World
Z1 Battle Royale 2018	Est. copies ≈ 6.2M–10.0M SteamSpy 10M–20M	Est. revenue Free	Free	202k reviews Mixed	SurvivalMassively Multiplayer
Hunt: Showdown 1896 2019	Est. copies ≈ 8.0M–13.1M SteamSpy 10M–20M	Est. revenue $66.3M–$178.3M after Steam's cut $120.6M–$274.4M before Steam's cut	$29.99	279k reviews Mostly Positive	Open WorldExtraction Shooter
DOOM 2016	Est. copies ≈ 9.2M–15.0M SteamSpy 5M–10M	Est. revenue $50.7M–$136.4M after Steam's cut $92.3M–$209.9M before Steam's cut	$19.99	222k reviews Overwhelmingly Positive	FPSGore
Black Mesa 2020	Est. copies ≈ 3.6M–5.8M SteamSpy 2M–5M	Est. revenue $19.8M–$53.2M after Steam's cut $35.9M–$81.8M before Steam's cut	$19.99	145k reviews Very Positive	FPSRemake
Wallpaper Engine 2018	Est. copies ≈ 31.0M–50.3M 4.8x vs typical SteamSpy 20M–50M	Est. revenue $42.5M–$114.3M after Steam's cut $77.3M–$175.9M before Steam's cut	$4.99	1.0M reviews Overwhelmingly Positive	MatureUtilities
Unturned 2017	Est. copies ≈ 19.4M–31.6M 2.7x vs typical SteamSpy 50M–100M	Est. revenue Free	Free	565k reviews Very Positive	Free to PlaySurvival
Killing Floor 2 2016	Est. copies ≈ 5.4M–8.8M SteamSpy 2M–5M	Est. revenue $44.4M–$119.4M after Steam's cut $80.8M–$183.7M before Steam's cut	$29.99	129k reviews Very Positive	ZombiesMultiplayer