App Overview

BALL x PIT icon

BALL x PIT

Devolver · Games

BALL x PIT is a brick-breaking, ball-fusing, base-building survival roguelite

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.8
756 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.

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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 included19 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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Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for BALL x PIT: 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

Add dynamic levels and challenges to enhance gameplay.

Assumption to check: Games can feel repetitive quickly.

Validate with people who use this workflow before building.

Hypothesis 2

Introduce social sharing and friend challenges.

Assumption to check: Limited user engagement features.

Validate with people who use this workflow before building.

Hypothesis 3

Implement a fair monetization strategy with clear benefits.

Assumption to check: In-app purchases may frustrate users.

Validate with people who use this workflow before building.

Hypothesis 4

Include achievement badges and progress tracking.

Assumption to check: Lack of feedback on user performance.

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

BALL x PIT is a brick-breaking, ball-fusing, base-building survival roguelite. Batter hordes of enemies with ricocheting balls and gather the riches of the pit to expand your homestead, generate resources and recruit unique heroes. BALL x PIT is a fast-paced fantasy roguelite where heroes must find the balls to plunge deeper into a seemingly bottomless pit of monsters. Develop arcane ammunition and resources in pursuit of treasure, recruiting additional heroes to aid you in your perilous quest. Ballbylon has fallen. After a meteoric and completely unexpected event annihilated the great city, all that remains is an ominous, yawning pit. Treasure hunters from far and wide flock to the city’s tomb to seek their fortune, plumbing the depths in search of Ballbylon’s scattered riches. Few return. The pit plays host to armies of barbaric creatures, hellbent on ending your quest before it even begins. Armed with a growing arsenal of magic-infused projectiles, batter your way through multiple levels of increasingly challenging obstacles to claim the ultimate prizes and rebuild New Ballbylon. Fuse Your Balls The Ball Fusion system encourages explosive experimentation with over 60 randomized balls to equip and combine during your journey. Discover overpowered combinations and unexpected synergies from hundreds of possible outcomes. Build New Ballbylon Expand New Ballbylon with over 70 unique buildings that provide gameplay bonuses and unlock further power-ups, new characters, and more! As your community grows, task homebound heroes with automated tasks to keep the resources coming while you dive deeper into the pit. Discover New Realms Face legions of diverse enemies within the pit, battling through barren deserts, frozen caverns, savage forests and more. Each region offers its own unique set of hazards on top of hordes of increasingly challenging foes and mighty, screen-filling bosses. Recruit Fellow Hunters As you explore the pit you’ll encounter fellow treasure hunters eager to add their skills to your expedition. Each character has unique, upgradable mechanics that totally change the way you play the game. Experimentation and adaptation are crucial to the success of New Ballbylon!

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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
Firebase
React Navigation
Axios
AsyncStorage
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.