# Zombie Army Trilogy

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

- Steam appid: 301640
- Developer: Rebellion
- Released: 2015 · Genre: Action · List price: $44.99
- Deal grade: A (A = dormant with >=$5k/mo opportunity, D = low signal)
- Est. net residual revenue: $9.9k to $14.9k per month (mid $12.4k)
- Opportunity score: $18.6k/month at x1.50 dormancy multiplier
- Est. lifetime owners: 921.6k · Est. lifetime net revenue: $8.9M
- Review sentiment: 86% positive across 18641 reviews (14179 from Steam purchases)
- Review velocity: 51.3 reviews/month (6-month average)

## Why it's flagged

- Developer active, last post 0 months ago
- Studio active elsewhere (20 titles tracked), so this one may welcome a partner
- Last build shipped 11.2 years ago
- Last discounted 0 months ago, 8 sales in the last 12 months
- Proven demand elasticity: x1.6 review velocity during past deep sales

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

| Stage | USD/month |
|---|---|
| Gross storefront sales | $22.5k |
| After VAT / sales tax (-13% blended) | $19.6k |
| After refunds (-9.5% median) | $17.7k |
| Net to developer (after Steam 30%) | $12.4k |

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

48, 114, 52, 65, 61, 64, 40, 94, 29, 64, 106, 72, 68, 60, 65, 47, 78, 55, 36, 78, 31, 44, 65, 54

## Estimated acquisition range

$297.8k to $595.7k (2-4x the trailing net annuity of $148.9k/year). Same error range applies.

## Analyst notes (AI-assisted)

A 2015 co-op action shooter that combines Sniper Elite's ballistics with Nazi-zombie hordes, built on Rebellion's proprietary tech stack.

Zombie Army Trilogy remains quietly profitable at $12,410/mo residual revenue on a 2015 release, driven by co-op appeal and Sniper Elite franchise fan crossover. However, the title faces a critical technical wall: modern OS/hardware incompatibility is the dominant pain point in player feedback, with stability crashes blocking both retention and new player acquisition. A technical refresh (engine update, DirectX modernization, Proton optimization) could unlock dormant catalog value and extend the IP's co-op licensing potential without major creative rework.

- Most realistic play: revival
- Risk (tech): Game exhibits systematic crashes on modern Windows and hardware configurations, blocking 2026+ player onboarding despite stable performance on older systems and Linux/Deck.
- Risk (market): Mainstream awareness is low (grade A elasticity but non-mainstream label); co-op-only design limits solo replay and seasonal engagement compared to live-service peers.
- Risk (other): Weapon and mechanic variety complaints suggest content ceiling; players note sniper-primary loadout feels restrictive versus parent Sniper Elite franchise.

What players are asking for:
- Fix stability crashes on modern Windows and hardware (appears in ~40% of negative reviews)
- Expand weapon/loadout variety beyond sniper-primary archetype
- Enable mod tools or community content creation
- Improve fullscreen and display options compatibility

Suggested first moves:
1. Commission a technical audit focused on DirectX/graphics API modernization, OS threading issues, and Proton layer optimization; prioritize fullscreen and AMD/Intel GPU stability.
2. A/B test a limited-scope patch (crash fix + mod-support API) in closed beta with 500 players; track retention lift and refund-rate reduction before full rollout.
3. Explore low-cost licensing partnerships with content creators (YouTube, Twitch) conditional on stability fix, to rebuild awareness and signal renewed support.

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/301640
Citation: please cite ResidualPlay (https://residualplay.com) when using these estimates.