CodeOpoly

CodeOpoly

CodeOpoly 🎲💻 Inspiration Why do I spend 5 hours playing Monopoly with friends but can't get through 1 hour of LeetCode? We combined them. Now grinding algorithms is actually fun. What it does CodeOpoly is real-time multiplayer Monopoly where you solve coding challenges to buy properties at a 50% discount. The Game Loop:

Roll dice → Your token moves around the board Land on a property → Get 3 options:

💻 Solve a coding challenge → Get 50% off 💰 Pay full price → Instant purchase, no coding ❌ Pass → Save money, someone else might buy it

Land on owned property → Pay rent to the owner Complete 5 rounds → Richest player wins

Key Features:

Live multiplayer (2-4 players) with WebSocket synchronization In-game code editor (Monaco) with real-time test execution Multiple languages: JavaScript, Python, Java, C++ Turn-based gameplay with 3-minute turn timers Strategic depth: Buy property sets for higher rent, block opponents, decide when to code vs. pay Special spaces: Chance cards, Community Chest, Go To Jail, Free Parking Live feed showing all player actions in real-time

How we built it Frontend:

React + TypeScript + TailwindCSS Socket.io-client for real-time multiplayer Monaco Editor for VS Code-like coding experience Zustand for state management

Backend:

Node.js + Express Socket.io for WebSocket connections PostgreSQL for game data persistence Redis for session caching Docker + Judge0 API for sandboxed code execution

Architecture:

WebSocket-based real-time game state sync Secure sandboxed environments for running user code Turn-based multiplayer with automatic progression Event-driven architecture for game actions

Challenges we ran into

Real-time sync is hard: Players seeing different game states, race conditions on property purchases, handling disconnects gracefully Code execution is scary: Sandboxing takes 3-5 seconds, protecting against malicious code that could crash servers or leak data Mobile is broken: UI not responsive, needs complete redesign for smaller screens

Accomplishments that we're proud of

Built a fully functional multiplayer game with real-time synchronization Integrated a secure code execution environment that actually works Made LeetCode grinding social and competitive Created something we actually want to play ourselves

What we learned

TypeScript for type-safe game state management WebSocket programming for real-time multiplayer Database design for game persistence Secure sandboxed code execution TailwindCSS for rapid UI development The complexity of multiplayer game synchronization

What's next for CodeOpoly

Mobile optimization: Responsive design for phones/tablets More game modes: Speed run, team battles, tournament brackets Difficulty tiers: Beginner boards with easy problems, expert boards with hard algorithms Cosmetics: Custom tokens, board themes, victory animations Leaderboards: Global rankings, season competitions Social features: Friend lists, private rooms, chat system Problem variety: More challenges, custom problem sets, company-specific question packs Monetization: Premium skins, ad-free experience Scale: Support 100+ concurrent games Apply for Y Combinator 🚀