# Book of Fei

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

- Steam appid: 3733510
- Developer: TAO Studio
- Released: 2026 · Genre: Casual · List price: $2.99
- Deal grade: C (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $1.1k to $1.7k per month (mid $1.4k)
- Opportunity score: $1.4k/month at x1.00 dormancy multiplier
- Est. lifetime owners: 10.9k · Est. lifetime net revenue: $10.9k
- Review sentiment: 94% positive across 363 reviews (341 from Steam purchases)
- Review velocity: 55.8 reviews/month (6-month average)

## Why it's flagged

- Developer active, last post 1 months ago
- Last build shipped 1 months ago
- Last discounted 0 months ago, 4 sales in the last 12 months

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

| Stage | USD/month |
|---|---|
| Gross storefront sales | $2.5k |
| After VAT / sales tax (-13% blended) | $2.2k |
| After refunds (-9.5% median) | $2.0k |
| Net to developer (after Steam 30%) | $1.4k |

## Monthly review counts, oldest to newest (6 months)

44, 68, 77, 62, 44, 40

## Markets by review language

- schinese: 87%
- brazilian: 1% (game NOT localized in this language)
- german: 1% (game NOT localized in this language)
- english: 8%
- koreana: 1%
- russian: 1% (game NOT localized in this language)
- spanish: 0% (game NOT localized in this language)
- japanese: 1%

## Methodology

Units are estimated from Steam-purchase reviews times a release-cohort multiplier (Boxleiter method, 20-75x by year). 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/3733510
Citation: please cite ResidualPlay (https://residualplay.com) when using these estimates.