App Overview

Castlevania: 40th Anniversary icon

Castlevania: 40th Anniversary

KONAMI · Games

The Castlevania game that started it all finally comes to mobile for a limited time.

Free

PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 3.1
75 ratings · Below Average

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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Castlevania: 40th Anniversary: 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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App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

Screenshots

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App Store description

The Castlevania game that started it all finally comes to mobile for a limited time. □Story In medieval Europe, the legend of Dracula is told in frightened whispers in the small country of Transylvania. Once every century, the prayers of those with evil in their hearts shall resurrect the Dark Lord Dracula. Each time he returns, his dark powers grow stronger than the last. One night there was a magnificent carnival being held in the bustling city. That night marked the 100th year anniversary of Dracula’s defeat at the hands of the hero Christopher Belmont. Suddenly, the town was enveloped by dark storm clouds and a bolt of lightning rained down, signaling that Count Dracula and his evil ambitions had returned to the world yet again. With the Belmont blood running though his veins, the young Vampire Hunter Simon knew that only he could face this evil. Taking up the whip enchanted with miraculous power given to him by his father, Simon hastened towards Dracula’s castle on his own. □Features The deep rich Castlevania history that began with this original game. The fated confrontation between Dracula and unforgettable action hero Simon Belmont that played out with a horrific twist groundbreaking for its time. The dark vast world of Castlevania that canonized the iconic whip-wielding character moves of Simon Belmont and the classic music tracks. Intense hard-to-beat action platformer that inspired a long-running and beloved franchise. Direct port of the original title with visual touchpad and playable offline. □ Important Notes ・The game will remain playable after its availability on the App Store ends. ・Please see the Terms of Use (Castlevania) available within the app before playing.

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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 affordable ad-free tier ($2.99)

Assumption to check: Too many intrusive ads

Validate with people who use this workflow before building.

Hypothesis 2

Cosmetic-only purchases, skill-based progression

Assumption to check: Pay-to-win mechanics

Validate with people who use this workflow before building.

Hypothesis 3

Add battery saver mode, optimize rendering

Assumption to check: Battery drain

Validate with people who use this workflow before building.

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
Unity
Firebase
AdMob
RevenueCat
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.