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Action-focused UnderMine launched in 2020 from thorium, with the same slug listed for developer and publisher. On Steam it has 9,792 reviews at 90% positive, rated Very Positive, and an initial price of $19.99.
Overview
UnderMine is a 2020 Action game developed by Thorium and published by Thorium. On Steam it has gathered 9,789 player reviews, 90% of them positive, which counts as a very positive reception among indie titles in the Action category. The game is available on linux, mac, windows, and launched at $20. The pairing of developer Thorium with publisher Thorium is one of the studio-publisher relationships indielist tracks, letting players find comparable games and letting developers and investors study how Action projects reach the market. indielist's white-box method estimates its lifetime sales at roughly 441,000 to 1.0 million 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, UnderMine can be compared against similar Action titles and benchmarked on review counts and estimated sales.
Reviews
9,789
Positive
90%
Steam appid
656350
Engine
Unknown
Sales estimate
vv1.0441K to 1.0M
units (median: 734K)
≈ $5.0M to $11.7M net revenue (Steam cut + refunds + regional discount applied)
+ - How is this calculated?
| Factor | Adjustment |
|---|---|
| base | +50 |
| year_2020 | +15 |
| price_$20 | 0 |
| positive_90% | +10 |
| final NB | 75 |
Confidence range: median × [0.6, 1.4]. Boundary protection: NB ∈ [15, 150].
Methodology & limitations
Sales estimates use a multi-factor Boxleiter method against public Steam review counts.
They are not authoritative sales data. Actual sales can deviate by
±50% in either direction. Free-to-play games, deeply discounted titles, and games
with heavy bundle distribution have larger error margins. Algorithm version
v1.0.
indielist estimates lifetime unit sales for UnderMine at roughly 441,000 to 1.0 million copies, with a median around 734,000, derived from its 9,789 Steam reviews using a multi-factor Boxleiter method (version v1.0). That median maps to approximately $8.4M 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
90d · low $10.25Over the last 90 days the price ranged from $10.25 to $19.99, averaging $18.74 across 3 discount windows, with a historical low of $10.25 on 2026-03-18.
Synthetic series for demo. Real ITAD price history loads after Day 3 ingest.
Where to buy
Affiliate disclosure- Steam reference$19.99 Buy
- Green Man Gaming
- Fanatical
- Humble Store
- GOG.com
Live prices from public feeds, cheapest first. Some are affiliate links — we may earn a commission at no extra cost to you. Learn more.
Platforms
linuxmacwindows
Frequently asked questions
- How many copies has UnderMine sold?
- indielist estimates UnderMine has sold between 440,505 and 1,027,845 units (median 734,175), derived from its 9,789 Steam reviews with the white-box Boxleiter vv1.0 method. The full breakdown is shown on the page.
- Who developed UnderMine?
- UnderMine was developed by Thorium and published by Thorium.
- When was UnderMine released?
- UnderMine was released in 2020.
- How many reviews does UnderMine have on Steam?
- UnderMine has 9,789 Steam reviews, of which 90% are positive.
Ecosystem
indielist positions UnderMine within the Action segment so players can surface comparable titles by shared tags and genre rather than by storefront promotion. On the developer side, Thorium's other releases and Thorium's wider catalog are one click away, letting developers benchmark where UnderMine 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 UnderMine page serves three audiences at once: players hunting their next Action 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.