How much revenue did Koi-Koi Japan [Hanafuda playing cards] make?

$157k–$422k after Steam's roughly 30% cut, derived from the copies estimate and its price.

How many copies did Koi-Koi Japan [Hanafuda playing cards] sell?

Q: How many copies did Koi-Koi Japan [Hanafuda playing cards] sell?

57k to 93k copies, based on its 1k Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 57k–93k; $157k–$422k after Steam's cut $285k–$649k before Steam's cut; from 1k reviews (Very 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 Koi-Koi Japan [Hanafuda playing cards] and predicted how it would do from its 8 similar games. Every figure here, including Koi-Koi Japan [Hanafuda playing cards]'s, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 946k–2.5M

best case 3.4M (Dota Underlords)

Games like Koi-Koi Japan [Hanafuda playing cards]

A typical game among these

≈ 946k–2.5M copies

≈ $9.5M after Steam's cut

from ~48k 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: Dota Underlords at ≈ 2.6M–4.3M copies.

The genre you'd be entering

These games: The similar games share Card Game (5 of 8) and Trading Card Game (5 of 8).
The winners: Winners here lead with Auto Battler + Tactical.
When they shipped: The similar games span 2012 to 2020, and none of them 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 79 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

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Yu-Gi-Oh! Duel Links 2017	Est. copies ≈ 1.5M–2.5M SteamSpy 2M–5M	Est. revenue Free	Free	45k reviews Very Positive	Free to PlayCard Game
Shadowverse CCG 2016	Est. copies ≈ 627k–1.0M SteamSpy 2M–5M	Est. revenue Free	Free	15k reviews Mostly Positive	Free to PlayCard Battler
Dota Underlords 2019	Est. copies ≈ 2.6M–4.3M 1.9x vs typical SteamSpy 5M–10M	Est. revenue Free	Free	91k reviews Very Positive	Free to PlayStrategy
UNO 2017	Est. copies ≈ 1.9M–3.0M SteamSpy 2M–5M	Est. revenue $5.1M–$13.8M after Steam's cut $9.3M–$21.2M before Steam's cut	$9.99	54k reviews Mostly Positive	Card GameMultiplayer
KARDS - The WW2 Card Game 2020	Est. copies ≈ 1.3M–2.1M SteamSpy 2M–5M	Est. revenue Free	Free	52k reviews Mixed	Free to PlayCard Game
Artifact 2018	Est. copies ≈ 753k–1.2M SteamSpy 1M–2M	Est. revenue Free	Free	25k reviews Mixed	Card BattlerDeckbuilding
Minion Masters 2019	Est. copies ≈ 1.9M–3.1M SteamSpy 500k–1M	Est. revenue Free	Free	65k reviews Very Positive	PvETrading Card Game
Ticket to Ride: Classic Edition 2012	Est. copies ≈ 346k–561k SteamSpy 500k–1M	Est. revenue Free	Free	5k reviews Very Positive	Board GameStrategy