How many copies did 20,000 Miles Under the Sea sell?

4k to 6k copies, based on its 157 Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did 20,000 Miles Under the Sea make?

20,000 Miles Under the Sea is free to play, so there is no copy-sales revenue to estimate.

How big is 20,000 Miles Under the Sea?

Estimated players who have it: ≈ 4k–6k; from 157 reviews (Mostly Negative)

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 20,000 Miles Under the Sea and predicted how it would do from its 8 similar games. Every figure here, including 20,000 Miles Under the Sea's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 20k–56k

best case 2.9M (Barotrauma)

Games like 20,000 Miles Under the Sea

A typical game among these

≈ 20k–56k copies

≈ $83k–$267k after Steam's cut

from ~765 reviews

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

3 of the 8 similar games are hits.

Best case: Barotrauma at ≈ 2.2M–3.6M copies, ≈ $21.5M–$57.8M after Steam's cut. It is a breakout hit, far above a typical game.

What their first month looked like

About half the games that made it here had over 198 reviews in their first month; the range was 11 to 43k.

The genre you'd be entering

These games: The similar games share Simulation (6 of 8) and Underwater (6 of 8).
The winners: Winners here lead with Co-op + Survival, priced around $35. The breakout hits carry Co-op + Survival Horror + 2D; a typical game here doesn't.
When they shipped: The similar games span 2014 to 2025, and 2 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 70 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
Beyond Blue 2020	Est. copies ≈ 38k–61k 2.0x vs typical SteamSpy 200k–500k	Est. revenue $207k–$558k after Steam's cut $377k–$858k before Steam's cut	$19.99	2k reviews Very Positive	UnderwaterAdventure
World of Diving 2014	Est. copies ≈ 43k–70k SteamSpy 200k–500k	Est. revenue Free	Free	765 reviews Mixed	SimulationAdventure
theBlu 2016	Est. copies ≈ 53k–86k 1.7x vs typical SteamSpy 200k–500k	Est. revenue Free	Free	1k reviews Very Positive	VRSimulation
Barotrauma 2023	Est. copies ≈ 2.2M–3.6M 118x vs typical SteamSpy 2M–5M	Est. revenue $21.5M–$57.8M after Steam's cut $39.1M–$88.9M before Steam's cut	$34.99	90k reviews Very Positive	Co-opMultiplayer
Death in the Water 2019	Est. copies ≈ 9k–14k SteamSpy 20k–50k	Est. revenue $7k–$20k after Steam's cut $13k–$30k before Steam's cut	$2.99	308 reviews Mostly Positive	UnderwaterAction
KURSK 2018	Est. copies ≈ 15k–24k SteamSpy 20k–50k	Est. revenue $83k–$222k after Steam's cut $150k–$341k before Steam's cut	$19.99	494 reviews Mixed	SubmarineNaval
You Can Save Everyone 2024	Est. copies ≈ 1k–2k too small to compare SteamSpy under 20k	Est. revenue $2k–$6k after Steam's cut $4k–$10k before Steam's cut	$5.99	58 reviews Very Positive	PuzzleExperimental
These Darker Tides 2025	Est. copies ≈ 2k–3k too small to compare SteamSpy under 20k	Est. revenue $4k–$12k after Steam's cut $8k–$18k before Steam's cut	$7.99	81 reviews Very Positive	HorrorUnderwater