Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Earn to Die 2
Drive your car through a zombie apocalypse in this massive follow-up to the chart-topping hit Earn to Die!
$0.29 · In-app purchases
OVERALL US RANK
#22
Paid · all categories
REVENUE (Est)
$407K/mo
$239K - $574K
RATING
★ 4.7
5,599 ratings · Top 15%
Evidence scope: #22 is the current overall US Paid chart position. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Earn to Die 2: map the core Games workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Introduce more diverse missions and challenges to maintain player interest.
Assumption to check: Game can become repetitive after extended play.
Validate with people who use this workflow before building.
Hypothesis 2
Ensure upgrades and purchases do not create a pay-to-win environment.
Assumption to check: In-app purchases can feel unbalanced.
Validate with people who use this workflow before building.
Hypothesis 3
Implement rewarding ads that enhance gameplay without interrupting it.
Assumption to check: Ads can disrupt gameplay.
Validate with people who use this workflow before building.
Hypothesis 4
Expand customization features to allow players to personalize their vehicles.
Assumption to check: Limited vehicle customization options.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Drive your car through a zombie apocalypse in this massive follow-up to the chart-topping hit Earn to Die! An evacuation ship is waiting on the other side of the country. The only thing that stands in your way: city after city overrun by zombies . With only a run-down car and a small amount of cash you face a familiar situation... to drive through hordes of zombies in order to survive! BRAND NEW STORY MODE Earn to Die 2 introduces a massive new Story Mode, five times longer than its predecessor. The game departs its familiar desert setting and delves into the depths of cities infested by zombies. MULTI-TIERED LEVELS: Levels are now multi-tiered! Drive across decayed highway overpasses, via underground tunnels, or smash through epic zombie filled factories. Whichever path you choose to take, you won't be able to escape the zombie hordes - your only choice is to smash through them! BUILD A ZOMBIE-SLAUGHTERING MACHINE Unlock and upgrade 10 different vehicles, including a sports car, a fire truck, and even an ice-cream van. Each vehicle can be equipped with a range of upgrades, such as armored frames, roof-mounted guns, boosters and more. Those zombies will stand no chance. DESTRUCTIBLE VEHICLES Vehicles are now fully destructible. Hang on for your life as your vehicle gets smashed to smithereens if you aren't too careful. MORE ZOMBIES. MORE DESTRUCTION. MORE MAYHEM. What are you waiting for? That rescue ship isn't going to wait forever! Prepare yourself for a wild ride - and seriously, there is nothing like smashing through zombie-filled factories!
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
React Navigation
redux
expo-game-engine
BUILD KIT DIFFICULTY
Advanced
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
