How many copies did The Plan sell?

An estimated 1.2M to 2.0M copies, based on its 24k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did The Plan make?

The Plan is free to play, so there is no copy-sales revenue to estimate.

How big is The Plan?

Estimated owners: ≈ 1.2M–2.0M; from 24k reviews (Very 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 The Plan out and predicted the genre from its 8 similar games. Every figure here, including The Plan's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 7.5M–17.6M

best case 39.9M (Wallpaper Engine)

The Multiplayer lane

A big, proven genre: most sell around 10.1M copies.

A typical game

≈ 10.1M copies

≈ $102.6M after Steam's cut

from ~241k reviews

Best case

≈ 39.9M copies

Wallpaper Engine · ≈ $76.9M after Steam's cut

from 1000k reviews

Copies and revenue are rough lifetime estimates from the review count; typical figures are medians per column, so they can come from different games.

The lane you'd be entering

Winners here lead with Mature + Utilities, priced around $5.
None of the games you compared shipped in the last two years; the newest is from 2020. That says more about your picks than about the market, so add newer similar games to read the timing.
A typical game here lands in Diamond ($1M+ before Steam's cut, est.). Tiers: Chris Zukowski's benchmark tiers.

Similar games

Game	Price	Reviews	Tags	Est. copies	Est. revenue
Wallpaper Engine 2018	Est. copies ≈ 30.4M–49.4M 4.1x vs typical SteamSpy 20M–50M	Est. revenue $41.7M–$112.1M net $75.8M–$172.5M gross	$4.99	1000k reviews Overwhelmingly Positive	MatureUtilities +6
Unturned 2017	Est. copies ≈ 19.4M–31.5M 2.3x vs typical SteamSpy 50M–100M	Est. revenue Free	Free	564k reviews Very Positive	Free to PlaySurvival +6
SCP: Secret Laboratory 2017	Est. copies ≈ 8.0M–13.0M SteamSpy 5M–10M	Est. revenue Free	Free	232k reviews Very Positive	Free to PlayMultiplayer +6
RimWorld 2018	Est. copies ≈ 7.4M–12.0M SteamSpy 5M–10M	Est. revenue $70.9M–$190.6M net $128.9M–$293.2M gross	$34.99	242k reviews Overwhelmingly Positive	Colony SimBase-Building +6
ASTRONEER 2019	Est. copies ≈ 4.0M–6.5M SteamSpy 2M–5M	Est. revenue $32.9M–$88.5M net $59.8M–$136.1M gross	$29.99	139k reviews Very Positive	MultiplayerOpen World +6
Squad 2020	Est. copies ≈ 6.3M–10.3M SteamSpy 2M–5M	Est. revenue $69.6M–$187.1M net $126.5M–$287.8M gross	$39.99	240k reviews Very Positive	MilitaryRealistic +6
Subnautica 2018	Est. copies ≈ 11.4M–18.5M 1.6x vs typical SteamSpy 5M–10M	Est. revenue $94.1M–$253.0M net $171.1M–$389.3M gross	$29.99	375k reviews Overwhelmingly Positive	Open World Survival CraftSurvival +6
Black Mesa 2020	Est. copies ≈ 3.8M–6.2M SteamSpy 2M–5M	Est. revenue $20.8M–$56.0M net $37.8M–$86.1M gross	$19.99	143k reviews Very Positive	FPSRemake +6