# 溺光症 Photophobia

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

**Measured on 2026-09-01 03:11 UTC.** The whole Steam catalog is re-measured daily; a game that just launched can move a lot between passes.

- Steam appid: 3888660
- Developer: ZeroZen工作室
- Released: 2026 · Genre: Casual · List price: $2.34
- Deal grade: B (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $149 to $223 per month (mid $186)
- Opportunity score: $353/month at x1.90 dormancy multiplier
- Est. lifetime owners: 1.0k · Est. lifetime net revenue: $785
- Review sentiment: 90% positive across 29 reviews (25 from Steam purchases)
- Review velocity: 9.5 reviews/month (6-month average)

## Why it's flagged

- No developer announcement on record, ever
- Last build shipped 3 months ago
- Store page localized in only 1 language(s)

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

| Stage | USD/month |
|---|---|
| Gross storefront sales | $338 |
| After VAT / sales tax (-13% blended) | $294 |
| After refunds (-9.5% median) | $266 |
| Net to developer (after Steam 30%) | $186 |

## Monthly review counts, oldest to newest (2 months)

21, 1

## Estimated acquisition range

$4.5k to $8.9k (2-4x the trailing net annuity of $2.2k/year). Same error range applies.

## Markets by review language

- english: 4% (game NOT localized in this language)
- schinese: 96% (game NOT localized in this language)

Localization gap: 100% of measured reviews are written in languages the game does not support (top: schinese). Localizing is likely immediate market expansion.

## 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/3888660
Citation: please cite ResidualPlay (https://residualplay.com) when you publish or quote these estimates.