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
Sudoku Master！
Sudoku Master — Clean & Focused Sudoku Free Number Games
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
62,534 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'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 Sudoku Master！: 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 a better hint system that suggests potential values for cells.
Assumption to check: Difficulty in solving puzzles due to lack of hints
Validate with people who use this workflow before building.
Hypothesis 2
Add daily challenges and achievements to keep users engaged.
Assumption to check: Limited user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free experience through a premium subscription.
Assumption to check: Ads can disrupt gameplay
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline play with sync capabilities.
Assumption to check: No offline play option
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
Sudoku Master — Clean & Focused Sudoku Free Number Games Sudoku Master is a clean, calm, and focused sudoku free app made for players who enjoy pure number logic and clear puzzle design. With minimalist visuals and smooth controls, Sudoku Master creates a simple and rewarding number puzzle experience built around clarity and logic. Whether you prefer easy levels or deeper logic puzzles, this sudoku free game keeps your mind sharp and relaxed. Enjoy quick breaks with light puzzles or challenge yourself with expert grids. All levels are available as sudoku free, giving you freedom to explore thousands of handcrafted challenges at your own pace. A Calm & Clear Sudoku Puzzle Experience Sudoku Master emphasizes clarity and comfort. Each puzzle loads instantly with a clean layout designed for focus. This calm sudoku free environment supports memory, reasoning, and gentle mind games. Daily challenges support brain training, while offline play lets you enjoy number puzzles anywhere. For uninterrupted solving, the optional sudoku no ads mode creates a distraction-free space. How to Play ● Use logic to complete each number grid. ● Fill rows, columns, and boxes without repeating numbers. ● Add pencil notes to track possibilities. ● Learn techniques through smart hints. ● Progress from easy sudoku to advanced logic challenges. Key Features ● Sudoku Free for All Levels — Thousands of handcrafted number puzzles suitable for all players. ● Minimalist, Clean Design — Soft visuals made for clarity and focus. ● Sudoku No Ads Option — Remove interruptions and stay centered. ● Offline Mode — Enjoy sudoku free anytime, even without WiFi. ● Smart Hints That Teach — Learn real strategies from math puzzle games. ● Mind Games & Logic Training — Strengthen memory through consistent play. ● Daily Sudoku Challenge — A new sudoku each day to train your brain. Why Players Love Sudoku Master Players appreciate the clean interface, steady pacing, and a structured puzzle-solving flow. Easy levels help beginners grow confidently, while advanced puzzles challenge experts. Teaching hints explain the reasoning behind moves, turning every puzzle into a meaningful logic exercise within a calm number-game experience. Start Your Sudoku Free Journey Download Sudoku Master and enjoy clean design, daily challenges, and relaxing sudoku free puzzles that strengthen logic and bring clarity to your day. Privacy Policy: https://www.hungrystudio.com/privacyus.html Terms of Use: https://www.hungrystudio.com/serviceus.html
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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
@react-navigation/native
@supabase/supabase-js
react-native-reanimated
zustand
BUILD KIT DIFFICULTY
Intermediate
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.
