👑 CrownCases – Limbo Game

A fully interactive, provably fair Limbo casino game built with pure HTML, CSS, and JavaScript.

This project replicates a modern crypto-style gambling experience with smooth animations, real-time probability calculations, and a provably fair system.

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🎮 Features

🎯 Core Gameplay

• Adjustable bet amount ($1 – $500)
• Custom target multiplier (1.09× – 1,000,000×)
• Real-time win chance calculation
• Instant profit preview
• Smooth animated rolling multiplier system
• Manual + Auto betting modes

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⚡ Game Mechanics

• 95% RTP (5% house edge)

• Formula:

  multiplier = 0.95 / (1 - u)
  

• Win probability:

  P(win) = 95 / target_multiplier
  

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🔐 Provably Fair System

• Uses:

  • Client Seed
  • Server Seed
  • Nonce

• Roll generation:

  HMAC-SHA256(serverSeed, clientSeed:nonce)
  

• Includes:

  • Server seed hash (pre-commitment)
  • Seed reveal system
  • Roll verification tool built into UI

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📊 Statistics Tracking

• Session Wins / Losses
• Total Wagered
• Net Profit & Loss
• Win Streak
• Best Multiplier
• Last Win

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📜 Bet History

• Full bet log with:

  • Bet amount
  • Target multiplier
  • Rolled result
  • Profit/Loss

• Live history strip (last 50 rolls)

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🤖 Auto Betting

• Set:

  • Number of bets
  • Delay between bets

• Live progress tracking

• Stop anytime

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🎨 UI & UX

• Modern dark-themed casino design

• Responsive layout

• Smooth animations:

  • Rolling multiplier
  • Win/Loss effects
  • Particle confetti on wins

• Sound effects:

  • Win / Loss / Roll ticking

• Fully customizable settings:

  • Sound toggles
  • Volume control
  • Fast roll mode
  • Particle effects toggle

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🚀 Getting Started

1. Clone the repo

git clone https://github.com/yourusername/crowncases-limbo.git

2. Open the game

Simply open the HTML file:

index.html

No build step required — runs directly in your browser.

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🧠 How It Works

1. A random float u is generated using HMAC-SHA256

2. The multiplier is calculated using:

   multiplier = 0.95 / (1 - u)
   

3. If:

   rolled_multiplier >= target_multiplier
   

   → You win

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⚠️ Disclaimer

This project is for:

• Educational purposes
• UI/UX demonstrations
• Game logic simulation

It does NOT include:

• Real money transactions
• Backend or wallet integration
• Security for production gambling use

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🛠 Tech Stack

• HTML5
• CSS3 (Custom properties, animations)
• Vanilla JavaScript
• Web Crypto API (HMAC + SHA256)

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💡 Future Improvements

• Backend integration (Node.js / Firebase)
• Real user accounts & authentication
• Crypto wallet support
• Multiplayer / live bets feed
• Leaderboards
• Mobile app version

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📸 Preview

Clean UI, real-time gameplay, and smooth animations inspired by modern crypto casinos.

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🧑‍💻 Author

Built for the CrownCases project.