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
Subway Surfers City
Billions of players can’t be wrong - run and jump back into the beloved world of Subway Surfers and rediscover your favorite endless running adventure with exciting new twists
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
16,698 ratings · Top 5%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Subway Surfers City: 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 daily challenges to keep players engaged.
Assumption to check: Repetitive gameplay can lead to boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Limit ads to specific intervals or provide ad-free options.
Assumption to check: Frequent ads can disrupt the gameplay experience.
Validate with people who use this workflow before building.
Hypothesis 3
Add more characters and skins with unique abilities.
Assumption to check: Limited character customization options.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the achievements system with clearer visibility and rewards.
Assumption to check: Difficulty in tracking achievements and progress.
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
Billions of players can’t be wrong - run and jump back into the beloved world of Subway Surfers and rediscover your favorite endless running adventure with exciting new twists. Progress through fresh hurdles, reach new heights, and collect new characters! Jake, Tricky, Fresh, and Yutani are ready - are you? Play Subway Surfers City now! Key features: - CHOOSE YOUR ADVENTURE: Switch seamlessly between thrilling endless runs chasing a new high score, or playing the all new City Tour! - UNCOVER SECRETS: Stomp and jump for a new way to play this runner game. Reach new depths and heights as you discover hard-to-reach Secret Stars! - COLLECT AND UPGRADE SURFERS & BOARDS: Each Surfer and Board has unique abilities, so upgrade and combine runners and boards to play your way! Collect them all, find Surfer and Board tokens to upgrade them all and build the strongest Crew! - WIN WITH NEW POWER-UPS & PERKS: Pick up new power-ups for the most powerful runs. Bubblegum shields you, batteries superpower your hoverboard, and drones get you to the highest points of Subway City! - UNLOCK LIVELY DISTRICTS: Explore all the secret corners of Subway City while running away from Guard and Dog. Earn XP to unlock new Districts! - COMPLETE MISSIONS AND WIN REWARDS: The crew needs you to run your best! Play smart and finish missions to unlock new items and win big. - CONQUER TRIALS: Are you ready to have your running skills challenged? Trials are adrenaline-pumping, limited runs that require your best performance to get the best rewards. - PLAY OFFLINE: Subway Surfers City is available offline! Play without wifi or internet connection. Access to some features will be limited. Download Subway Surfers City now and play for free! Some in-game items can also be purchased for real money.
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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
Zustand
FastAPI
react-native-reanimated
expo-ads-admob
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.
