How many copies did Underworld Idle sell?

34k to 55k copies, based on its 1k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Underworld Idle make?

Underworld Idle is free to play, so there is no copy-sales revenue to estimate.

How big is Underworld Idle?

Estimated players who have it: ≈ 34k–55k; from 1k reviews (Mostly Positive)

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 Underworld Idle and predicted how it would do from its 8 similar games. Every figure here, including Underworld Idle's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 903k–3.2M

best case 3.0M (Cookie Clicker)

Games like Underworld Idle

A typical game among these

≈ 903k–3.2M copies

≈ $5.9M after Steam's cut

from ~29k 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.

Best case: Cookie Clicker at ≈ 2.3M–3.8M copies, ≈ $3.2M–$8.5M after Steam's cut.

What their first month looked like

About half the games that made it here had over 11k reviews in their first month; the range was 1k to 26k.

The genre you'd be entering

These games: The similar games share Clicker (8 of 8) and Idler (7 of 8).
The winners: Winners here lead with Clicker + Idler, priced around $5.
When they shipped: The similar games span 2015 to 2025, 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 61 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
IdleOn - The Incremental MMO 2025	Est. copies ≈ 741k–1.2M SteamSpy 1M–2M	Est. revenue Free	Free	30k reviews Mostly Positive	IdlerPixel Graphics
Cookie Clicker 2021	Est. copies ≈ 2.3M–3.8M 3.2x vs typical SteamSpy 2M–5M	Est. revenue $3.2M–$8.5M after Steam's cut $5.8M–$13.1M before Steam's cut	$4.99	93k reviews Overwhelmingly Positive	ClickerIdler
AdVenture Capitalist 2015	Est. copies ≈ 2.9M–4.8M 2.1x vs typical SteamSpy 5M–10M	Est. revenue Free	Free	60k reviews Very Positive	ClickerIdler
Mr.Mine 2020	Est. copies ≈ 463k–752k SteamSpy 500k–1M	Est. revenue Free	Free	19k reviews Very Positive	IdlerClicker
Cell to Singularity - Evolution Never Ends 2021	Est. copies ≈ 698k–1.1M SteamSpy 1M–2M	Est. revenue Free	Free	28k reviews Very Positive	ClickerFree to Play
Leaf Blower Revolution - Idle Game 2020	Est. copies ≈ 657k–1.1M SteamSpy 1M–2M	Est. revenue Free	Free	26k reviews Very Positive	IdlerClicker
Clicker Heroes 2015	Est. copies ≈ 3.0M–4.9M 2.1x vs typical SteamSpy 5M–10M	Est. revenue Free	Free	62k reviews Very Positive	ClickerIdler
Sakura Clicker 2015	Est. copies ≈ 698k–1.1M SteamSpy 1M–2M	Est. revenue Free	Free	14k reviews Very Positive	NudityFree to Play