How many copies did SAS: Zombie Assault 4 sell?

332k to 540k 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 owners: ≈ 332k–540k; from 10k 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 SAS: Zombie Assault 4 out and predicted the genre from its 8 similar games. Every figure here, including SAS: Zombie Assault 4's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 7.8M–15.4M

best case 40.4M (Wallpaper Engine)

Games like SAS: Zombie Assault 4

The middle of these games

≈ 7.8M–15.4M copies

≈ $77.9M–$93.3M after Steam's cut

from ~212k 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: Wallpaper Engine at ≈ 30.8M–50.0M copies, ≈ $42.2M–$113.5M after Steam's cut.

The genre you'd be entering

Your set: Your set clusters on FPS (6 of 8) and Open World (4 of 8).
The winners: Winners here lead with Mature + Utilities, priced around $5.
The era: None of the games you compared shipped in the last two years; the newest is from 2020. That says more about your picks than about the market, so add newer similar games to read the timing.

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–11.3M SteamSpy 5M–10M	Est. revenue Free	Free	202k 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–13.0M SteamSpy 10M–20M	Est. revenue $87.8M–$236.2M after Steam's cut $159.7M–$363.4M before the cut	$39.99	277k reviews Mostly Positive	Open WorldExtraction Shooter
DOOM 2016	Est. copies ≈ 9.2M–15.0M SteamSpy 5M–10M	Est. revenue $50.6M–$136.0M after Steam's cut $92.0M–$209.3M before the cut	$19.99	221k reviews Overwhelmingly Positive	FPSGore
Black Mesa 2020	Est. copies ≈ 3.6M–5.8M SteamSpy 2M–5M	Est. revenue $19.7M–$53.0M after Steam's cut $35.8M–$81.5M before the cut	$19.99	145k reviews Very Positive	FPSRemake
Wallpaper Engine 2018	Est. copies ≈ 30.8M–50.0M 4.8x vs typical SteamSpy 20M–50M	Est. revenue $42.2M–$113.5M after Steam's cut $76.8M–$174.6M before the 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–8.7M SteamSpy 2M–5M	Est. revenue $44.4M–$119.3M after Steam's cut $80.6M–$183.5M before the cut	$29.99	129k reviews Very Positive	ZombiesMultiplayer