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
Sonic The Hedgehog Classic
The Sonic game that started it all is now free-to-play and optimized for mobile devices!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.0
16,438 ratings · Top 30%
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 included18 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 Sonic The Hedgehog 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
Introduce new characters with unique abilities and more diverse levels.
Assumption to check: Limited character options and lack of level variety.
Validate with people who use this workflow before building.
Hypothesis 2
Provide more free content and reduce the reliance on in-app purchases.
Assumption to check: In-app purchases can disrupt gameplay experience.
Validate with people who use this workflow before building.
Hypothesis 3
Implement rewarded ads that enhance gameplay without interrupting.
Assumption to check: Ads can be intrusive to gameplay.
Validate with people who use this workflow before building.
Hypothesis 4
Add difficulty adjustments or tutorials to help new players.
Assumption to check: Difficulty spikes can frustrate players.
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 Sonic game that started it all is now free-to-play and optimized for mobile devices! Race at lightning speeds across seven classic zones as Sonic the Hedgehog. Run and spin through loop-de-loops as you collect rings and defeat enemies on your mission to save the world from the evil Dr. Eggman. Sonic the Hedgehog joins the SEGA Forever Classic Games Collection, a treasure trove of free SEGA console classics brought to life on mobile for the first time!" FEATURES - OPTIMIZED FOR MOBILE Sonic The Hedgehog now plays in widescreen at a smooth 60FPS offering unrivalled performance and the game’s legendary soundtrack has been fully re-mastered. - GOTTA GO FAST - Challenge yourself with an all-new Time Attack mode! - NEW PLAYABLE CHARACTERS Play as Sonic’s friends Tails and Knuckles for the first time. Use their unique abilities to fly, climb, and glide around levels offering exciting new ways to explore. - CONTROLLER SUPPORT Sonic The Hedgehog offers exclusive support for the Power A Moga, Nyko, XBOX, and all HID controllers. SEGA FOREVER FEATURES - PLAY FREE - LEADERBOARDS – compete with the world for high scores - CONTROLLER SUPPORT: MFi compatible controllers - GAMES RELEASED EVERY MONTH - Download them all! - INCLUDES iOS 10 STICKER PACKS RETRO REVIEWS - "Believe the hype - this is the tidiest, smoothest and most exhilarating game you'll have ever seen." [97%] - Andy Smith, SEGA Power #22 (September 1991) - “Difficult without being frustrating, addictive without being repetitive, and altogether a joy to play.” [925/1000] - Gary Whitta, ACE #47 (August 1991) - "One of the best Mega Drive games I've ever played" [92%] - Rich Leadbetter, Mean Machines #10 (July 1991) TRIVIA - Sonic Jam contained the first release of Sonic The Hedgehog that gave Sonic his spin dash move, which returns again in this remake - Sonic The Hedgehog was also released in arcades on SEGA's Mega-Tech and Mega Play systems - Rabbit and armadillo characters were considered for Sonic before settling on a hedgehog design - While "Eggman" is Dr. Robotnik's nickname in the West, he has always been known as "Eggman" in Japan CLASSIC GAME FACTS - First released in the US on June 23rd, 1991 - It took Yuji Naka almost a year to finish designing Green Hill Zone Act 1 - Spring Yard Zone and Scrap Brain Zone were originally called Sparkling Zone and Clock Work Zone - Music composed by Masato Nakamura of Dreams Come True fame - - - - - Privacy Policy: https://privacy.sega.com/en/soa-pp Terms of Use: https://games.sega.com/eula/ Game apps are ad-supported and no in-app purchases are required to progress; ad-free play option available with in-app purchase. Other than for users known to be under 13, this game may include "Interest Based Ads" and may collect "Precise Location Data". Please see our privacy policy for more information. © SEGA. All rights reserved. SEGA, the SEGA logo, Sonic the Hedgehog, SEGA Forever, and the SEGA Forever logo are registered trademarks or trademarks of SEGA CORPORATION or its affiliates.
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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.
