How many copies did M.A.R.S. sell?

29k to 47k copies, based on its 1k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did M.A.R.S. make?

M.A.R.S. is free to play, so there is no copy-sales revenue to estimate.

How big is M.A.R.S.?

Estimated players who have it: ≈ 29k–47k; from 1k reviews (Mixed)

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 M.A.R.S. and predicted how it would do from its 8 similar games. Every figure here, including M.A.R.S.'s, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 1.1M–3.2M

best case 7.1M (World of Warships)

Games like M.A.R.S.

A typical game among these

≈ 1.1M–3.2M copies

≈ $5.7M–$10.4M after Steam's cut

from ~35k 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.

No genre covers most of these similar games. The closest is Shooter (4 of 8), so its genre is hard to place.

Of the 416 indie games that passed 1,000 reviews in 2022, 11.8% were novel genre mixes and 88.2% stuck to an established genre. Published indie market research.

Best case: World of Warships at ≈ 5.4M–8.8M copies.

What their first month looked like

About half the games that made it here had over 4k reviews in their first month; the range was 883 to 28k.

The genre you'd be entering

These games: The similar games share Shooter (4 of 8) and Co-op (3 of 8).
The winners: Winners here lead with Naval Combat + Co-op.
When they shipped: The similar games span 2016 to 2024, and 1 of the 8 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 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
Alien Swarm: Reactive Drop 2017	Est. copies ≈ 819k–1.3M SteamSpy 200k–500k	Est. revenue Free	Free	24k reviews Very Positive	Twin Stick ShooterPvE
Crossout 2017	Est. copies ≈ 2.4M–3.9M 2.0x vs typical SteamSpy 5M–10M	Est. revenue Free	Free	70k reviews Mostly Positive	Third PersonGun Customization
World of Warships 2017	Est. copies ≈ 5.4M–8.8M 4.5x vs typical SteamSpy 20M–50M	Est. revenue Free	Free	157k reviews Mostly Positive	Free to PlayNaval Combat
Plants vs. Zombies: Battle for Neighborville™ 2020	Est. copies ≈ 468k–760k SteamSpy 1M–2M	Est. revenue $3.9M–$10.4M after Steam's cut $7.0M–$15.9M before Steam's cut	$29.99	19k reviews Mostly Positive	MultiplayerThird-Person Shooter
Tom Clancy’s The Division® 2 2023	Est. copies ≈ 906k–1.5M SteamSpy 1M–2M	Est. revenue $7.5M–$20.1M after Steam's cut $13.6M–$30.9M before Steam's cut	$29.99	37k reviews Mostly Positive	Looter ShooterOpen World
Zero Hour 2024	Est. copies ≈ 829k–1.3M SteamSpy 500k–1M	Est. revenue $2.3M–$6.1M after Steam's cut $4.1M–$9.4M before Steam's cut	$9.99	33k reviews Mostly Positive	TacticalShooter
World of Tanks 2021	Est. copies ≈ 2.5M–4.1M 2.9x vs typical SteamSpy 1M–2M	Est. revenue Free	Free	101k reviews Mostly Positive	TanksFree to Play
Infestation: The New Z 2016	Est. copies ≈ 1.4M–2.3M SteamSpy 5M–10M	Est. revenue Free	Free	34k reviews Mixed	ZombiesFree to Play