How many copies has SUNLESS SEA sold?

indielist estimates SUNLESS SEA has sold between 411,426 and 959,994 units (median 685,710), derived from its 7,619 Steam reviews with the white-box Boxleiter v1.0 method. The full breakdown is shown on the page.

Who published SUNLESS SEA?

SUNLESS SEA was published by Failbetter Games, developed by Failbetter Games. See Failbetter Games's full catalogue and submission status on indielist.

When was SUNLESS SEA released?

SUNLESS SEA was released in 2015.

How many reviews does SUNLESS SEA have on Steam?

SUNLESS SEA has 7,619 Steam reviews, of which 83% are positive.

Is SUNLESS SEA worth playing?

Steam players rate SUNLESS SEA 83% positive across 7,619 reviews. indielist doesn't score games editorially; it surfaces public review sentiment and a white-box sales estimate so you can judge reception and reach yourself.

SUNLESS SEA

Feb 6, 2015 Adventure $18.99

Developer Failbetter Games Publisher Failbetter Games

Profile updated Jun 2026

Adventure gameplay anchors SUNLESS SEA, a 2015 release from Failbetter Games. The game is self-published by failbetter-games and has 9,509 Steam reviews with an 83% positive rating, marked mostly positive, with an initial price of $18.99.

SUNLESS SEA is a 2015 Adventure game developed by Failbetter Games and published by Failbetter Games. On Steam it has gathered 7,619 player reviews, 83% of them positive, which counts as a mostly positive reception among indie titles in the Adventure category. The game is available on linux, mac, windows, and launched at $19. The pairing of developer Failbetter Games with publisher Failbetter Games is one of the studio-publisher relationships indielist tracks, letting players find comparable games and letting developers and investors study how Adventure projects reach the market. indielist's white-box method estimates its lifetime sales at roughly 411,000 to 960,000 units, with the full Boxleiter factor breakdown shown on this page rather than a single black-box figure. Within indielist's catalog of indie games mapped to their studios, publishers, and funding, SUNLESS SEA can be compared against similar Adventure titles and benchmarked on review counts and estimated sales.

Reviews

7,619

Positive

83%

Steam appid

304650

Engine

Unknown

Players (snapshot)

Unavailable

Sales estimate

v1.0

411K to 960K

units (median: 686K)

≈ $4.5M to $10.4M modeled net revenue (fixed store-cut, refund, and regional-price assumptions applied)

411K median 960K

+ How is this calculated?

7,619 reviews × NB(90) = 685,710 median units

Factor	Adjustment
base	+50
year_2015	+30
price_$19	0
positive_83%	0
genre_Adventure	+10
final NB	90

Heuristic display range: median × [0.6, 1.4]. Boundary protection: NB ∈ [15, 150].

Methodology & limitations

Sales estimates use an additive Boxleiter-derived heuristic against public Steam review counts. They are not authoritative sales data, and the fixed display range is not a statistically validated confidence interval. Actual results may fall outside it, especially for deeply discounted or bundle-heavy titles. Algorithm version v1.0. Read the exact method and validation status.

indielist estimates lifetime unit sales for SUNLESS SEA at roughly 411,000 to 960,000 copies, with a median around 686,000, derived from its 7,619 Steam reviews using a multi-factor Boxleiter method (version v1.0). That median maps to approximately $7.4M in net revenue after Steam's 30% cut, regional pricing, and refunds. Unlike black-box trackers, the full calculation is shown on this page: a base review-to-sales multiplier is adjusted for release year, launch price, review sentiment, studio size, and genre, and every adjustment is listed so developers, publishers, and investors can audit exactly how the figure was reached. The range itself reflects genuine uncertainty — review-to-sales ratios vary widely between games — so indielist publishes a low, median, and high band rather than a false-precision single number, and treats free-to-play, heavily discounted, and bundle-distributed titles as having wider error margins still.

Price history

50 observed days · window low $6.45

Across 50 observed UTC days from 2026-06-10 to 2026-09-07, the daily lowest tracked USD price across stores ranged from $6.45 to $18.99. The tracked-window low was $6.45 on 2026-06-10.

Real store observations · daily lowest tracked USD price across stores · missing days are not filled.

Where to buy

Affiliate disclosure

Steam reference

$18.99 Buy
GOG.com

$18.99 Buy
Green Man Gaming

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Fanatical

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Humble Store

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Latest tracked store observations (2026-09-07 06:14 UTC), cheapest first. Prices may have changed since observation. Some are affiliate links — we may earn a commission at no extra cost to you. Learn more.

Platforms

linuxmacwindows

Genres

AdventureIndieRPG

Frequently asked questions

How many copies has SUNLESS SEA sold?: indielist estimates SUNLESS SEA has sold between 411,426 and 959,994 units (median 685,710), derived from its 7,619 Steam reviews with the white-box Boxleiter v1.0 method. The full breakdown is shown on the page.
Who developed SUNLESS SEA?: SUNLESS SEA was developed by Failbetter Games and published by Failbetter Games.
Who published SUNLESS SEA?: SUNLESS SEA was published by Failbetter Games, developed by Failbetter Games. See Failbetter Games's full catalogue and submission status on indielist.
When was SUNLESS SEA released?: SUNLESS SEA was released in 2015.
How many reviews does SUNLESS SEA have on Steam?: SUNLESS SEA has 7,619 Steam reviews, of which 83% are positive.
Is SUNLESS SEA worth playing?: Steam players rate SUNLESS SEA 83% positive across 7,619 reviews. indielist doesn't score games editorially; it surfaces public review sentiment and a white-box sales estimate so you can judge reception and reach yourself.

Players looking for games like SUNLESS SEA can compare it on indielist against semantically similar Adventure titles such as Subnautica, Raft, Satisfactory, Human Fall Flat, ranked by shared tags and genre rather than by ad spend. On the developer side, Failbetter Games's other releases and Failbetter Games's wider catalog are one click away, letting developers benchmark where SUNLESS SEA sits among a studio's body of work and how its publisher's portfolio performs. Because indielist maps studios, publishers, games, and funding into one connected graph, the same SUNLESS SEA page serves three audiences at once: players hunting their next Adventure game, developers studying how comparable projects were positioned and what they sold, and investors tracing which teams and labels are active in the space. A machine-readable markdown mirror of this page is published at the same path with a .md suffix for AI assistants, and its review, price, and sales-estimate figures are refreshed on a schedule rather than frozen at launch.

Matched from shared Steam tags and primary genre. Review count breaks ties; it is not a personal recommendation score.