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
Royal Kingdom
From the creators of Royal Match comes a brand new match 3 puzzle adventure in Royal Kingdom, starring the extended Royal Family!
Free · In-app purchases
OVERALL US RANK
#26
Grossing · all categories
REVENUE (Est)
$1.4M/mo
$824K - $2.0M
RATING
★ 4.7
1,131,719 ratings · Top 15%
Evidence scope: #26 is the current overall US Grossing 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 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/
Preview a sample Build Kit No email needed
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 Royal Kingdom: 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
Implement clearer purchase confirmations and user education.
Assumption to check: In-app purchases can be confusing and lead to unintentional spending.
Validate with people who use this workflow before building.
Hypothesis 2
Balance gameplay to ensure free users can progress at a reasonable pace.
Assumption to check: Users report slow game progression without spending money.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce more customization features to enhance user engagement.
Assumption to check: Limited customization options for users' kingdoms.
Validate with people who use this workflow before building.
Hypothesis 4
Improve testing and QA processes to enhance stability.
Assumption to check: Occasional bugs and crashes during gameplay.
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
From the creators of Royal Match comes a brand new match 3 puzzle adventure in Royal Kingdom, starring the extended Royal Family! You’ll meet King Richard, King Robert's younger brother, as well as a charming cast of new characters, including Princess Bella and the Wizard, to embark on a journey to build legendary kingdoms! Solve match 3 puzzles to explore new lands and defeat the Dark King & his army! MASTER MATCH 3 PUZZLES Test your skills and become the ultimate match 3 expert by solving fun yet challenging puzzles! Beat thrilling levels and overcome unique obstacles! BUILD AND EXPLORE KINGDOMS With the help of the Builder, craft a kingdom befitting royalty. Solve puzzles, earn coins, and unlock diverse districts - from the Parliament Square to the University and the Princess Tower. CONQUER THE DARK KING Defend the kingdom from the Dark King’s attack by solving match 3 puzzles - destroy his castles and evil minions to see him fall. Victory is one match away! EXPAND YOUR RULING Rise through the ranks and claim the top spot on the leaderboard, master your puzzle solving skills for generous rewards, and expand your kingdom by uncovering uncharted lands as you play! ENJOY THE FINEST VISUALS Immerse yourself in Royal Kingdom's stunning graphics and smooth animations. A puzzle game experience like never before - captivating and seamless. What are you waiting for? Download Royal Kingdom and join the ranks of the noble adventurers! With hours of fun, challenging gameplay, and a magical world, this puzzle game is fit for royalty! Need some help? Visit our support page in the Royal Kingdom app or send us a message at [email protected].
Written user reviews are not shown here. Check current App Store reviews >
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
Zustand
react-native-reanimated
expo-router
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.
