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
Ball Guys : Stumble & Fall
Amazing new feature: Powers!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
753 ratings · Top 15%
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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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 Ball Guys : Stumble & Fall: 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 loading indicators and optimize asset management.
Assumption to check: Long loading times between games
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a wider range of avatar customization features.
Assumption to check: Limited customization options for avatars
Validate with people who use this workflow before building.
Hypothesis 3
Add more diverse game modes and challenges.
Assumption to check: Repetitive gameplay can become boring
Validate with people who use this workflow before building.
Hypothesis 4
Provide a premium version with reduced ads.
Assumption to check: Frequent ads disrupt 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
Amazing new feature: Powers! Unlock, upgrade & master 18 incredible Powers to make your Ball jump further, land on Lava, stick to walls, sabotage others with bombs or simply look cool flying on a rocket. Need to jump that little bit further? Use your Hop. Want to fly all the way up? Use Helium balloons to get there. Found a small gap? Become Tiny! The combos are almost endless. Express your ultimate Ball Guys skills now! Adventure mode Enjoy hours and hours of solo gameplay & master the game in over 600 levels of incredibly varied challenges. After you’ve mastered the basics, you’ll be challenged by Zero Gravity, Rising Lava, Mazes, Water Portals and so much more. Did you know: over 30% of these levels have been made by our Discord community! Did you come from TikTok? Play with Streamers! Join with Room Code! Play with your favourite Streamer and up to 256 other players in Treasure Hunts, Rising Lava challenges, Only Up battles, The Box, The Quiz, Impossible Challenges and and so much more. Sabotage or help the Streamer - it’s your choice! Battle mode Think you’re a Pro? Choose your three Powers and Battle it out in challenging 1v5 three-round races vs. real human players. Note: Powers is a new experimental mode. Play at your own risk, don’t Stumble & Fall! The Cannon Launch The Cannon, earn glory on the leaderboard and win amazing in-game prizes. Made famous by TikTok, nobody truly knows why it’s so satisfying to watch and play. Our Community… The Back story to Ball Guys Stumble & Fall Ball Guys was launched as a 3-week old prototype in October 2024. Inspired by our incredible Discord Community, the team at Half Moon Studios have done over 30 updates to “find the fun”. People told us to add Skins, so we did. People demanded a level editor, so we gave it to them. And when we removed one of our accidents (the infamous Double Jump), people complained. So we’ve now given them 18 Powers to play with. What’s next we wonder? Join our incredible community (not a cult!) at Discord.gg/Ballguys. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Firebase
Redux
React Navigation
Axios
BUILD KIT DIFFICULTY
Expert
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.
