# Cold Waters

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

- Steam appid: 541210
- Developer: Killerfish Games
- Released: 2017 · Genre: Indie · List price: $39.99
- Deal grade: A (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $2.9k to $4.3k per month (mid $3.6k)
- Opportunity score: $7.5k/month at x2.10 dormancy multiplier
- Est. lifetime owners: 252.5k · Est. lifetime net revenue: $2.2M
- Review sentiment: 87% positive across 4731 reviews (4591 from Steam purchases)
- Review velocity: 16.7 reviews/month (6-month average)

## Why it's flagged

- Developer silent for 5.6 years
- Studio active elsewhere (3 titles tracked), so this one may welcome a partner
- Last build shipped 8.1 years ago
- Store page localized in only 1 language(s)
- Last discounted 1 months ago, 5 sales in the last 12 months

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

| Stage | USD/month |
|---|---|
| Gross storefront sales | $6.5k |
| After VAT / sales tax (-13% blended) | $5.7k |
| After refunds (-9.5% median) | $5.1k |
| Net to developer (after Steam 30%) | $3.6k |

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

31, 23, 36, 26, 39, 18, 13, 20, 19, 8, 9, 19, 17, 15, 16, 11, 17, 19, 15, 15, 14, 20, 21, 15

## Estimated acquisition range

$86.0k to $171.9k (2-4x the trailing net annuity of $43.0k/year). Same error range applies.

## Analyst notes (AI-assisted)

Cold Waters is a submarine combat simulator that blends realistic naval warfare mechanics with accessible gameplay.

Cold Waters has accumulated $2.17M lifetime net revenue from 252k units on steady residual income of $3.6k/mo, despite minimal marketing post-launch. The 87% positive score and strong player retention (50+ hour sessions common) signal durable product-market fit in a niche that rarely sees new AAA entries. For a naval-sim focused publisher or a studio seeking low-risk catalog depth, this represents profitable quiet IP with room for modest revival via cosmetic content, mod tooling, or a sequel pitch.

- Most realistic play: watch
- Risk (market): Niche submarine-sim audience is small and has few competing titles; growth ceiling may be structural rather than tactical.
- Risk (tech): Built in 2017; codebase age and engine choice (likely Unity) may constrain modern platform expansion or VR integration.
- Risk (other): Developer silent for 67 months; unclear if studio retains capacity or appetite to support post-acquisition updates.

What players are asking for:
- Quality-of-life UI improvements and control remapping for accessibility
- Mod tools or workshop integration for campaign and scenario creation
- Multiplayer modes or cooperative gameplay
- Visual modernization and expanded unit rosters (additional submarine classes, NATO expansion)

Suggested first moves:
1. Secure developer asset and IP audit; confirm whether Killerfish Games retains rights, team capacity, and willingness to discuss acquisition or licensing partnership.
2. Run cohort analysis on Steam reviews and player sessions to identify which cosmetics, scenarios, or mod-tools would unlock the highest re-engagement spend.
3. Evaluate porting cost to console (Nintendo Switch as niche fit) and assess VR prototype feasibility to capture adjacent sim audiences.

Generated 2026-08-20 from public signals and player reviews. Directional, not diligence.

## 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/541210
Citation: please cite ResidualPlay (https://residualplay.com) when using these estimates.