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
Book of Secrets
Trilobyte's Book of Secrets is the indispensable player guide for navigating Stauf's mansion and its many devilish puzzles
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
9 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 included14 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 Book of Secrets: map the core Reference 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 user-generated secrets and community contributions
Assumption to check: Limited content variety
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize categories and secret tags
Assumption to check: Lack of personalization options
Validate with people who use this workflow before building.
Hypothesis 3
Integrate social sharing options for secrets
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Clarify benefits of in-app purchases with a detailed comparison
Assumption to check: In-app purchase confusion
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
Trilobyte's Book of Secrets is the indispensable player guide for navigating Stauf's mansion and its many devilish puzzles. Stauf got you stuck? Want to make the taunts stop? Look no further. The Book of Secrets will help you out! Walk-throughs, hints and solutions for all the puzzles in The 7th Guest and The 11th Hour plus some bonus music tracks! No "guest" should be caught without one. At least if you expect to get out alive. The Book of Secrets also includes the original scripts for The 7th Guest and The 11th Hour as an added bonus! "The 7th Guest iPhone game is awesome. And absurdly frustrating. Am apparently no smarter than I was at 10." - @land_the_plane "Does anyone remember the computer game, 7th guest?! So creepy and awesome. @looooo3 and I were too dumb to complete the game." - @sparklystephiee "Which way should I go now? :p I'm not getting far with the chess puzzle in 7th guest." - @ineedausername "We've been staring at the frigging "letter can puzzle" in The 7th Guest for like an hour now and we're honestly this close to snapping our respective iPads and iPhones over our knees at this point. ... Wait, maybe if ... no, that won't work!" - Justin McElroy, Joystiq Stay Connected Follow us on twitter at http://twitter.com/trilobytegames and connect with us on Facebook http://facebook.com/trilobytegames.
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
Supabase
Zustand
React Navigation
Axios
BUILD KIT DIFFICULTY
Starter
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.
