# LURRUNA - The Island of Towering Automatons

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

**Measured on 2026-09-17 08:43 UTC.** The whole Steam catalog is re-measured daily; a game that just launched can move a lot between passes.

- Steam appid: 4315900
- Developer: PD_CGT
- Released: 2026 · Genre: Action · List price: $9.99
- Deal grade: B (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $392 to $588 per month (mid $490)
- Opportunity score: $784/month at x1.60 dormancy multiplier
- Est. lifetime owners: 1.0k · Est. lifetime net revenue: $3.4k
- Review sentiment: 98% positive across 47 reviews (25 from Steam purchases)
- Review velocity: 5.9 reviews/month (6-month average)

## Why it's flagged

- No developer announcement on record, ever
- Last build shipped 1 months ago
- 47% of reviews come from key activations (excluded from revenue estimates)
- Store page localized in only 4 language(s)

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

| Stage | USD/month |
|---|---|
| Gross storefront sales | $890 |
| After VAT / sales tax (-13% blended) | $774 |
| After refunds (-9.5% median) | $700 |
| Net to developer (after Steam 30%) | $490 |

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

12, 10

## Missed seasonal-sale revenue (modeled)

Skipped 1 Steam seasonal sale window(s) in the last 2 months. Running a -50% discount in those windows is modeled at +$502 net in total, assuming a unit uplift of x3.0 (industry-typical for old catalog titles). Same ±30-50% error range applies.

## Estimated acquisition range

$11.8k to $23.5k (2-4x the trailing net annuity of $5.9k/year). Same error range applies.

## Markets by review language

- english: 88%
- spanish: 4%
- japanese: 8%

## 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/4315900
Citation: please cite ResidualPlay (https://residualplay.com) when you publish or quote these estimates.