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 2 Classic
One of the best selling SEGA games of all time - Sonic The Hedgehog 2 is now available for free on mobile! Rediscover SEGA’s super Sonic masterpiece!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
10,924 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 included15 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 Sonic The Hedgehog 2 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 levels and challenges regularly
Assumption to check: Repetitive gameplay can lead to boredom
Validate with people who use this workflow before building.
Hypothesis 2
Offer more free content and fair pricing
Assumption to check: In-app purchases can frustrate players
Validate with people who use this workflow before building.
Hypothesis 3
Allow players to unlock or customize characters with unique items
Assumption to check: Limited character customization options
Validate with people who use this workflow before building.
Hypothesis 4
Implement adjustable difficulty settings for players
Assumption to check: Difficulty spikes can be frustrating
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
One of the best selling SEGA games of all time - Sonic The Hedgehog 2 is now available for free on mobile! Rediscover SEGA’s super Sonic masterpiece! Dr. Eggman is back to his old tricks, trying to find the seven Chaos Emeralds that will enable him to complete his ultimate weapon, the Death Egg. Only the triple threat of Sonic, Tails, and Knuckles can defeat him in this remaster from the team behind Sonic Mania! Sonic The Hedgehog 2 joins the ever-increasing line-up of ‘SEGA Forever’, a treasure trove of free SEGA console classics brought to life on mobile for the first time! FEATURES - Twelve Badnik-infested zones to master, from underwater caverns to neon-lit casinos! - Compete online, take on the Time Attack mode, and the all-new Boss Attack mode! - Play the secret Hidden Palace Zone stage that didn't make it into the original release! - Fight Dr. Eggman's creations, including the terrifying Mecha Sonic - Obtain all the Chaos Emeralds to transform into Super Sonic and Super Knuckles! MOBILE GAME FEATURES - PLAY FREE with ad-support or ad-free via In-App Purchase - SAVE YOUR GAMES – save your progress at any point in the game. - LEADERBOARDS – compete with the world for high scores RETRO REVIEWS "Without doubt, it's SEGA's best game ever." [96%] - Stuart Clarke, Mega Zone #25 (December 1992) "Faster, slicker, more colourful, louder, bigger, and much, much tougher than the original." [96%] - Julian "Jaz" Rignall, Mean Machines SEGA #2 (November 1992) "Packs a ton more punch than Bluey's first outing." [94%] - Paul Anglin, Computer & Video Games #132 (November 1992) SONIC THE HEDGEHOG 2 TRIVIA - This is the most complete version of Sonic The Hedgehog 2 to date, complete with widescreen, 60FPS action, and a remastered soundtrack! - This was the first Sonic game to feature the Spin Dash move - The Master System version was the first game Tails appeared in, although he wasn’t playable! - Unlike the Mega Drive/Genesis original, you can now fly as Tails! SONIC THE HEDGEHOG 2 HISTORY - The game was originally released worldwide in November 1992 - Original developer: Sonic Team & SEGA Technical Institute - Designer: Hirokazu Yasuhara - Lead Composer: Masato Nakamura - - - - - 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 and SONIC THE HEDGEHOG 2, 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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Redux
TypeScript
React Navigation
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.
