How many copies did SAS: Zombie Assault 4 sell?

An estimated 331k to 538k 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: ≈ 331k–538k; 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–15.0M

best case 39.9M (Wallpaper Engine)

The FPS lane

A big, proven genre: most sell around 9.7M copies.

A typical game

≈ 9.7M copies

≈ $77.7M after Steam's cut

from ~211k reviews

Best case

≈ 39.9M copies

Wallpaper Engine · ≈ $76.9M after Steam's cut

from 1000k reviews

Copies and revenue are rough lifetime estimates from the review count; typical figures are medians per column, so they can come from different games.

The lane you'd be entering

Winners here lead with Mature + Utilities, priced around $5.
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.
A typical game here lands in Diamond ($1M+ before Steam's cut, est.). Tiers: Chris Zukowski's benchmark tiers.

Similar games

Game	Price	Reviews	Tags	Est. copies	Est. revenue
theHunter: Call of the Wild™ 2017	Est. copies ≈ 6.9M–11.2M SteamSpy 5M–10M	Est. revenue $37.8M–$101.7M net $68.7M–$156.4M gross	$19.99	200k reviews Very Positive	HuntingOpen World +6
Z1 Battle Royale 2018	Est. copies ≈ 6.2M–10.0M SteamSpy 10M–20M	Est. revenue Free	Free	203k reviews Mixed	SurvivalMassively Multiplayer +6
Hunt: Showdown 1896 2019	Est. copies ≈ 7.9M–12.9M SteamSpy 10M–20M	Est. revenue $65.3M–$175.6M net $118.8M–$270.2M gross	$29.99	275k reviews Mostly Positive	Open WorldExtraction Shooter +6
DOOM 2016	Est. copies ≈ 8.8M–14.3M SteamSpy 5M–10M	Est. revenue $48.2M–$129.7M net $87.7M–$199.6M gross	$19.99	219k reviews Overwhelmingly Positive	FPSGore +6
Black Mesa 2020	Est. copies ≈ 3.8M–6.2M SteamSpy 2M–5M	Est. revenue $20.8M–$56.0M net $37.8M–$86.1M gross	$19.99	143k reviews Very Positive	FPSRemake +6
Wallpaper Engine 2018	Est. copies ≈ 30.4M–49.4M 4.7x vs typical SteamSpy 20M–50M	Est. revenue $41.7M–$112.1M net $75.8M–$172.5M gross	$4.99	1000k reviews Overwhelmingly Positive	MatureUtilities +6
Unturned 2017	Est. copies ≈ 19.4M–31.5M 2.7x vs typical SteamSpy 50M–100M	Est. revenue Free	Free	564k reviews Very Positive	Free to PlaySurvival +6
Killing Floor 2 2016	Est. copies ≈ 5.2M–8.4M SteamSpy 2M–5M	Est. revenue $42.6M–$114.4M net $77.4M–$176.1M gross	$29.99	129k reviews Very Positive	ZombiesMultiplayer +6