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
Level Devil - NOT A Troll Game
A nice, peaceful platformer
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
54,472 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/
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 Level Devil - NOT A Troll Game: 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 new mechanics and randomization to keep gameplay fresh.
Assumption to check: Levels can become repetitive after extended play.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a subscription model to remove ads and provide premium content.
Assumption to check: Ads can interrupt gameplay experience.
Validate with people who use this workflow before building.
Hypothesis 3
Add more avatar customization features to enhance user engagement.
Assumption to check: Limited customization options for player avatars.
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate social sharing options to improve community interaction.
Assumption to check: Lack of social features for sharing 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
A nice, peaceful platformer Run, jump, reach the door, and enjoy a calm little adventure full of fair levels, friendly spikes, trustworthy platforms, and perfectly normal surprises. You will definitely not rage. You will definitely not die again and again. And every trap is probably just your imagination. Level Devil is a relaxing skill game for players who love hard platformers, impossible jumps, funny fails, and totally safe little challenges. Test your timing, trust the floor, avoid the spikes, ignore the traps, and prove that you are invincible. Or don’t. That’s fine too. Features: - 240+ happy little levels - Simple controls for very skilled people - Spikes, traps, and other friendly decorations - Funny fails you will want to pretend never happened - Local 2-player mode to share the suffering - Secrets, surprises, and completely fair level design - A peaceful experience for fans of rage games, hard platformers, memes, and dying again This is not a troll game. This is not impossible. This is not trying to trick you. Please download Level Devil and have a wonderful, relaxing time. You deserve it.
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 Navigation
Expo
React Native Reanimated
Axios
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.
