How much revenue did Half-Life 2: Episode One make?

Half-Life 2: Episode One is free to play, so there is no copy-sales revenue to estimate.

How many copies did Half-Life 2: Episode One sell?

Q: How many copies did Half-Life 2: Episode One sell?

2.0M to 3.2M copies, based on its 31k Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 2.0M–3.2M; from 31k reviews (Overwhelmingly Positive)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left Half-Life 2: Episode One out and predicted the genre from its 8 similar games. Every figure here, including Half-Life 2: Episode One's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 3.2M–14.8M

best case 31.7M (Cyberpunk 2077)

Games like Half-Life 2: Episode One

The middle of these games

≈ 3.2M–14.8M copies

≈ $27.7M–$146.5M after Steam's cut

from ~145k reviews

Only the top fifth of 2019’s Steam releases earned about $34k gross, so plan for that or less.

All 8 of your similar games are hits.

Best case: Cyberpunk 2077 at ≈ 24.2M–39.3M copies, ≈ $399.0M–$1072.8M after Steam's cut.

What it took to get here

About half the games that made it here had over 32k reviews in their first month; the spread ran 482 to 326k.

The genre you'd be entering

Your set: Your set clusters on FPS (8 of 8) and Sci-fi (7 of 8).
The winners: Winners here lead with Cyberpunk + Open World, priced around $60.
The era: The games you compared span 2004 to 2021, 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

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Half-Life 2: Episode Two 2007	Est. copies ≈ 2.6M–4.2M SteamSpy 5M–10M	Est. revenue Free	Free	41k reviews Overwhelmingly Positive	FPSAction
BioShock Infinite 2013	Est. copies ≈ 9.2M–14.9M SteamSpy 2M–5M	Est. revenue $75.8M–$203.9M after Steam's cut $137.9M–$313.7M before the cut	$29.99	145k reviews Very Positive	FPS Story Rich
Halo: The Master Chief Collection 2019	Est. copies ≈ 7.5M–12.3M 1.8x vs typical SteamSpy 5M–10M	Est. revenue $83.0M–$223.2M after Steam's cut $150.9M–$343.3M before the cut	$39.99	262k reviews Very Positive	Great SoundtrackFPS
Black Mesa 2020	Est. copies ≈ 3.6M–5.8M SteamSpy 2M–5M	Est. revenue $19.7M–$53.0M after Steam's cut $35.8M–$81.5M before the cut	$19.99	145k reviews Very Positive	FPSRemake
Half-Life 2 2004	Est. copies ≈ 17.6M–28.6M 1.9x vs typical SteamSpy 10M–20M	Est. revenue $48.3M–$130.0M after Steam's cut $87.9M–$200.0M before the cut	$9.99	278k reviews Overwhelmingly Positive	FPSAction
Cyberpunk 2077 2020	Est. copies ≈ 24.2M–39.3M 6.7x vs typical SteamSpy 20M–50M	Est. revenue $399.0M–$1072.8M after Steam's cut $725.5M–$1650.4M before the cut	$59.99	975k reviews Very Positive	CyberpunkOpen World
Deus Ex: Human Revolution - Director's Cut 2013	Est. copies ≈ 1.9M–3.1M SteamSpy 2M–5M	Est. revenue $10.4M–$27.9M after Steam's cut $18.9M–$42.9M before the cut	$19.99	30k reviews Very Positive	CyberpunkStealth
INDUSTRIA 2021	Est. copies ≈ 107k–174k SteamSpy 500k–1M	Est. revenue $587k–$1.6M after Steam's cut $1.1M–$2.4M before the cut	$19.99	4k reviews Mostly Positive	FPSAction