How many copies has Zup! X sold?

indielist estimates Zup! X has sold between 155,016 and 361,704 units (median 258,360), derived from its 6,459 Steam reviews with the white-box Boxleiter v1.0 method. The full breakdown is shown on the page.

Who developed Zup! X?

Zup! X was developed by Quiet River and published by Quiet River.

Who published Zup! X?

Zup! X was published by Quiet River, developed by Quiet River. See Quiet River's full catalogue and submission status on indielist.

How many reviews does Zup! X have on Steam?

Zup! X has 6,459 Steam reviews, of which 96% are positive.

Is Zup! X worth playing?

Steam players rate Zup! X 96% positive across 6,459 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.

Zup! X

May 17, 2018 Casual $1.99

Developer Quiet River Publisher Quiet River

Profile updated Jul 2026

A casual indie game from quiet-river, Zup! X fits the low-price puzzle/physics niche for budget-focused players. Released in 2018 and priced at $1.99, it has 6,812 Steam reviews with 96% positive, and is published by quiet-river.

Zup! X is a 2018 Casual game developed by Quiet River and published by Quiet River. On Steam it has gathered 6,459 player reviews, 96% of them positive, which counts as a overwhelmingly positive reception among indie titles in the Casual category. The game is available on windows, and launched at $2. The pairing of developer Quiet River with publisher Quiet River is one of the studio-publisher relationships indielist tracks, letting players find comparable games and letting developers and investors study how Casual projects reach the market. indielist's white-box method estimates its lifetime sales at roughly 155,000 to 362,000 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, Zup! X can be compared against similar Casual titles and benchmarked on review counts and estimated sales.

Reviews

6,459

Positive

96%

Steam appid

508900

Engine

Unknown

Players (snapshot)

Unavailable

Sales estimate

v1.0

155K to 362K

units (median: 258K)

≈ $176K to $411K modeled net revenue (fixed store-cut, refund, and regional-price assumptions applied)

155K median 362K

+ How is this calculated?

6,459 reviews × NB(40) = 258,360 median units

Factor	Adjustment
base	+50
year_2018	+15
price_$2	-20
positive_96%	+10
genre_Casual	-15
final NB	40

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 Zup! X at roughly 155,000 to 362,000 copies, with a median around 258,000, derived from its 6,459 Steam reviews using a multi-factor Boxleiter method (version v1.0). That median maps to approximately $294K 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

6 observed days · window low $1.99

Across 6 observed UTC days from 2026-07-17 to 2026-07-22, the daily lowest tracked USD price across stores ranged from $1.99 to $1.99. The tracked-window low was $1.99 on 2026-07-17.

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

Where to buy

Affiliate disclosure

Steam reference

$1.99 Buy
Green Man Gaming

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Fanatical

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Humble Store

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GOG.com

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Latest tracked store observations (2026-07-22 19:45 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

windows

Genres

CasualIndie

Frequently asked questions

How many copies has Zup! X sold?: indielist estimates Zup! X has sold between 155,016 and 361,704 units (median 258,360), derived from its 6,459 Steam reviews with the white-box Boxleiter v1.0 method. The full breakdown is shown on the page.
Who developed Zup! X?: Zup! X was developed by Quiet River and published by Quiet River.
Who published Zup! X?: Zup! X was published by Quiet River, developed by Quiet River. See Quiet River's full catalogue and submission status on indielist.
When was Zup! X released?: Zup! X was released in 2018.
How many reviews does Zup! X have on Steam?: Zup! X has 6,459 Steam reviews, of which 96% are positive.
Is Zup! X worth playing?: Steam players rate Zup! X 96% positive across 6,459 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 Zup! X can compare it on indielist against semantically similar Casual titles such as Garry's Mod, Wallpaper Engine, Factorio, Balatro, ranked by shared tags and genre rather than by ad spend. On the developer side, Quiet River's other releases and Quiet River's wider catalog are one click away, letting developers benchmark where Zup! X 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 Zup! X page serves three audiences at once: players hunting their next Casual 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.