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
Kingdom Rush Frontiers TD
Kingdom Rush Frontiers is a whole new level of the furiously fast, enchantingly charming gameplay that made kingdom Rush an award-winning Tower Defense hit.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
16,383 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 included18 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 Kingdom Rush Frontiers TD: 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 unique towers and hero abilities for better gameplay diversity.
Assumption to check: Limited tower and hero variety
Validate with people who use this workflow before building.
Hypothesis 2
Add new game modes and challenges to keep players engaged.
Assumption to check: Repetitive gameplay mechanics
Validate with people who use this workflow before building.
Hypothesis 3
Implement adjustable difficulty settings to accommodate different player skills.
Assumption to check: Difficulty spikes in level progression
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the purchasing process and provide clearer value for items.
Assumption to check: In-app purchases can be confusing
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
Kingdom Rush Frontiers is a whole new level of the furiously fast, enchantingly charming gameplay that made kingdom Rush an award-winning Tower Defense hit. Defend exotic lands from dragons, man-eating plants, and ghastly denizens of the underworld -all with flashy towers, levels, heroes, and more goodies to help you crush your enemies to a pulp. BUILD MIGHTY TOWERS! • OVER 18 TOWER ABILITIES! Unleash Death Riders, pestilence clouds, or assassins that steal and kill your enemies! • 8 SPECIALIZED TOWER UPGRADES! Slice, sizzle, and stomp your foes with Crossbow Forts, Mighty Templars, Necromancers, and even Earthquake Machines - hey, we told you we were shaking things up. • UPGRADE SYSTEM allows you to min/max your towers towards your preferred strategy. • Fortify the frontier in exotic news lands - hold the line in deserts, jungles, and even the underworld! TRAIN LEGENDARY HEROES • 16 LEGENDARY HEROES. Choose among mighty champions and train their abilities! Each has unique specialties that fit different play styles and strategies! • Special units and features on every stage! Watch out for the Black Dragon! DEFEAT THEM ALL • OVER 40 ENEMIES with unique abilities! Stay on your toes as you fight through desert sandworms, tribal shamans, nomad tribes, and underground terrors. Action like you have never seen before! • MERCILESS BOSS FIGHTS! Hey, we told you to get those upgrades... MORE MIND-BOGGLING CONTENT • Hours of army with OVER 80 ACHIEVEMENTS! what can you expect from Ironhide Games, the creators of Kingdom rush? You will be hooked for hours searching for Easter eggs and achievements! • IN-GAME ENCYCLOPEDIA! learn all about your enemies and you will be able to plan the best strategy to defeat them. Study up! • CLASSIC, IRON, AND HEROIC GAME MODES to challenge your tactical skills! • 3 DIFFICULTY MODES! Are you up for a real challenge? Go with Hard mode! • PLAY IT OFFLINE! No internet? No problem! You will be able to jump into real action even offline! ----------------------------------------------------- PRAISE FOR KINGDOM RUSH: IGN Editor's Choice, Slide To Play Must Have, 148 Apps Editor's Choice, Jay is Games Game of the Year, Pocket Gamer Gold Award, Touch Arcade 4.5/5 - Indonesia Rating (IGRS): 13+ This game has been officially rated by the Indonesia Games Rating System (IGRS). - Terms and Conditions: https://www.ironhidegames.com/TermsOfService Privacy Policy: https://www.ironhidegames.com/PrivacyPolicy Video creators, podcast creators, and streamers: We would love to see your content on Youtube and Twitch! We support and promote channel creators so, if you want us to showcase your videos or want to know more about our games, feel free to write to us to [email protected]
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
React Navigation
Zustand
React Native Reanimated
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.
