# Big Sister

> ResidualPlay case file: an overlooked Steam game still earning residual revenue. Estimates carry a ±30-50% error range per title.

**Measured on 2026-09-22 08:42 UTC.** The whole Steam catalog is re-measured daily; a game that just launched can move a lot between passes.

- Steam appid: 5206420
- Developer: HaHaHaGame
- Released: 2026 · Genre: Casual · List price: $0.99
- Deal grade: B (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $226 to $339 per month (mid $282)
- Opportunity score: $451/month at x1.60 dormancy multiplier
- Est. lifetime owners: 1.4k · Est. lifetime net revenue: $478
- Review sentiment: 100% positive across 36 reviews (36 from Steam purchases)
- Review velocity: 34.0 reviews/month (6-month average)

## Why it's flagged

- No developer announcement on record, ever
- Studio active elsewhere (3 titles tracked), so this one may welcome a partner
- Last build shipped 0 months ago

## Where a gross dollar goes (monthly, at current velocity)

| Stage | USD/month |
|---|---|
| Gross storefront sales | $512 |
| After VAT / sales tax (-13% blended) | $445 |
| After refunds (-9.5% median) | $403 |
| Net to developer (after Steam 30%) | $282 |

## Estimated acquisition range

$6.8k to $13.5k (2-4x the trailing net annuity of $3.4k/year). Same error range applies.

## Markets by review language

- schinese: 100%

## Methodology

Units are estimated from Steam-purchase reviews times a release-cohort multiplier, 40-75x by year. Cohorts from 2020 on are calibrated against 182 sales milestones announced by developers; older ones follow the published Boxleiter tables. Revenue uses an effective price (lifetime discounts and regional pricing) and nets out VAT (~13%), refunds (~9.5%) and Steam's 30% cut: roughly 55% of gross reaches the developer.

Source: https://residualplay.com/game/5206420
Citation: please cite ResidualPlay (https://residualplay.com) when you publish or quote these estimates.