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
Clay Jam Classic
Clay Jam is back!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
420 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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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 Clay Jam Classic: 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
Offer more character skins and customization features.
Assumption to check: Limited character customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement a gradual difficulty curve with tutorial levels.
Assumption to check: Game difficulty spikes too quickly
Validate with people who use this workflow before building.
Hypothesis 3
Provide an ad-free experience via a one-time purchase or subscription.
Assumption to check: Ads can interrupt gameplay
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing and competitive leaderboards.
Assumption to check: Lack of social features
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
Clay Jam is back! The classic fun-packed action game, with over 10 million downloads, is ready to roll again! Save the land of Clay Jam from the fearsome Bully Beasts. Guide Fat Pebble as he rolls down five weird and wonderful hills in a world made entirely from clay! Squash monsters on the way, and he'll grow and grow and GROW! Get all the way to the bottom of the hill and meet the nasty Bully Beasts. Can you collect enough clay to free the monsters and save Clay Jam?! Features: ● EVERYTHING in the game is made from real clay! ● Family-friendly - no in-app purchases or ads, plus offline play ● Squash, roll and bounce your way through a very peculiar world ● A unique control system - gouge paths in the clay to steer ● Loads of hand-made monsters to discover ● 5 amazingly strange hills to rebuild ● 5 fearsome Bully Beasts to defeat ● Brilliantly original music ● Fantastically funny sound effects ● A game of hope & kindness for the whole family! *************** Editor's Choice in over 100 countries #1 Kids game in 46 countries #1 Action game in 10 countries Nominated for a BAFTA! Nominated for the Pocket Gamer awards! Over 10 million downloads! *************** USA Today “Clay Jam is a blast to play for kids and kids at heart, so be sure to roll over to the App Store to download the game.” Pocket Gamer Full of character and colour, Clay Jam is easy to pick up and very hard to put down. It's also one of the most refreshing freemium games around, rewarding you for continual play rather than punishing you for not spending money. Modojo An incredible artistic and technical achievement with very satisfying gameplay and progression. Kotaku ... every lovingly-molded inch of Clay Jam is an uncanny delight. Gametrailers - App of the Day Clay Jam is a very rare treat on the App Store. It's refreshingly different from the rest of the pack, plays like a dream, and is balanced so perfectly that both kids and adults alike will get a suitable level of challenge from the game. Download this immediately. Gamezebo ... Clay Jam is an extremely satisfying experience shaped from mounds of sheer joy.
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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.
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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.
