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
Math Puzzle Games - Crossmath®
The best Math Puzzle Games - Cross Math Game for you! Relax and train your brain now! Play it anywhere, anytime!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
244,088 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/
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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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Math Puzzle Games - Crossmath®: 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 puzzle types and difficulty levels.
Assumption to check: Limited variety in puzzles can become repetitive.
Validate with people who use this workflow before building.
Hypothesis 2
Implement rewarded ads and a premium ad-free experience.
Assumption to check: Some users find the ads intrusive.
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing options for achievements and scores.
Assumption to check: Not enough social features for sharing achievements.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a dynamic difficulty adjustment based on user performance.
Assumption to check: Difficulty balancing between easy and hard puzzles.
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
The best Math Puzzle Games - Cross Math Game for you! Relax and train your brain now! Play it anywhere, anytime! Crossmath game is a fun and engaging math puzzle game that tests your problem-solving skills. The game features a variety of levels and difficulty settings, so you can find the perfect challenge for your math skill level. To play, you'll need to solve a series of math problems, using addition, subtraction, multiplication, and division. You'll also need to use logic and critical thinking skills to figure out the best way to solve each puzzle. Crossmath is a great way to get your brain working and improve your math skills! Key Features - Use addition, subtraction, multiplication, and division to complete the math puzzle - Multiplication or Division should be calculated first, and then addition or subtraction Highlights - You can choose the difficulty of levels - Easy, Medium, Hard, and Expert. - Daily Challenge. One cross math puzzle a day keeps the neurologist away. - Endless mode. In this mode, errors will not be checked before you finally submit your answers. The more levels completed in two mistakes, the higher score you will get. Crossmath Math Puzzle Game is the perfect way to test your problem-solving skills and have fun while doing it. So what are you waiting for? Give Crossmath a try today! Crossmath also features a variety of power-ups that can help you solve puzzles faster. These power-ups can give you hints, advanced notes, etc. With all these features, this cross math puzzle game is sure to provide you with hours of fun and challenge. So why not give it a try? You can quickly master the game and become a Crossmath pro and math master in no time! Enjoy the math puzzle games and train your brain now! Download and Play this math puzzle game! Privacy Policy: https://crossmath.gurugame.ai/policy.html Terms of Service: https://crossmath.gurugame.ai/termsofservice.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
Supabase
Zustand
React Navigation
TypeScript
BUILD KIT DIFFICULTY
Starter
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.
