# Mysterium: A Psychic Clue Game

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

- Steam appid: 556180
- Developer: Twin Sails Interactive
- Released: 2017 · Genre: Strategy · List price: $6.99
- Deal grade: B (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $115 to $173 per month (mid $144)
- Opportunity score: $374/month at x2.60 dormancy multiplier
- Est. lifetime owners: 28.9k · Est. lifetime net revenue: $43.4k
- Review sentiment: 75% positive across 922 reviews (525 from Steam purchases)
- Review velocity: 3.8 reviews/month (6-month average)

## Why it's flagged

- Developer silent for 8.7 years
- Studio active elsewhere (2 titles tracked), so this one may welcome a partner
- Last build shipped 7.6 years ago
- 43% of reviews come from key activations (excluded from revenue estimates)
- No Steam discount in 4.0 years (deepest tracked: -0%)

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

| Stage | USD/month |
|---|---|
| Gross storefront sales | $261 |
| After VAT / sales tax (-13% blended) | $227 |
| After refunds (-9.5% median) | $206 |
| Net to developer (after Steam 30%) | $144 |

## Monthly review counts, oldest to newest (24 months)

2, 3, 3, 3, 0, 7, 1, 0, 0, 1, 5, 4, 3, 3, 1, 4, 6, 14, 4, 3, 2, 4, 4, 6

## Missed seasonal-sale revenue (modeled)

Skipped 12 Steam seasonal sale window(s) in the last 24 months. Running a -50% discount in those windows is modeled at +$1.1k 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

$3.5k to $6.9k (2-4x the trailing net annuity of $1.7k/year). Same error range applies.

## 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/556180
Citation: please cite ResidualPlay (https://residualplay.com) when using these estimates.