Karma Rush: Reddit Idle Arena

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  Main Interface

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  Leaderboard

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  Farm Karma Layout

About the Project Karma Rush: Reddit Idle Arena is a Reddit-native idle game built using Devvit. It transforms a Reddit post into an interactive experience where users farm karma, unlock engagement multipliers, automate passive growth, earn achievement milestones, and compete on a live global leaderboard. The goal was to explore how Reddit posts can evolve from static content into dynamic, gamified community experiences.

💡 Inspiration Reddit is built around engagement and karma, but that engagement is usually passive — users scroll, upvote, and comment. We wanted to ask: What if karma itself became a game mechanic?

Karma Rush was inspired by idle/incremental games and Reddit’s culture of competition and progression. The idea was to gamify Reddit’s core concept — karma — and turn it into a real-time, interactive experience directly inside a post. 🎮 What It Does Karma Rush allows users to: 🚀 Farm karma through interaction ⚡️ Unlock multiplier upgrades 🤖 Automate passive karma generation 🏆 Earn milestone achievements 🌍 Compete on a live global leaderboard 🔄 Maintain progress using backend persistence All of this runs natively inside Reddit using Devvit.

🛠 How We Built It Karma Rush was built using: Devvit SDK for Reddit-native integration React (Client-side) for UI and game logic Hono (Server-side) for backend API routing Redis for persistent score tracking Redis Sorted Sets for the live leaderboard system We used Devvit’s context system to access Reddit identity and connect player progression directly to Reddit usernames. The leaderboard uses Redis sorted sets to efficiently rank players by highest karma.

⚔️ Challenges We Ran Into Backend Rate Limiting Risks Initially, upgrade purchases triggered multiple decrement calls, which could overload the backend. We had to redesign the upgrade economy to ensure stability. Leaderboard Data Modeling Implementing a real leaderboard required understanding Redis data structures. Switching to sorted sets significantly improved performance and scalability. Balancing Simplicity and Depth We wanted the game to feel deep without overengineering it during the hackathon time constraint. Devvit Build & Deployment Flow Understanding the Devvit playtest and launch lifecycle required careful iteration.

🏆 Accomplishments We're Proud Of Implemented a real-time global leaderboard using Redis sorted sets Successfully integrated Reddit identity into gameplay Built a full idle progression system within a Reddit post Delivered a polished UI/UX within limited hackathon time Maintained backend stability while adding advanced features Most importantly, we transformed a Reddit post into a fully interactive experience.

📚 What We Learned Devvit enables powerful backend-driven experiences inside Reddit Redis sorted sets are ideal for ranking systems Stability and simplicity matter more than feature overload in hackathons Thoughtful UX and progression design dramatically increase perceived value We also learned how to strategically scope features under time constraints.

🔮 What’s Next for Karma Rush? Future plans include: 🌐 Subreddit-wide competitive seasons 🎯 Community-based team challenges 🏅 Weekly leaderboard resets 💎 Cosmetic badge unlock systems 📊 Advanced player analytics 🔔 Real-time multiplayer interactions Long-term vision: Turn Reddit communities into interactive competitive ecosystems powered by Devvit apps. This reads like a serious submission. Not like “we made a clicker.”

Built With

• devvit
• hono
• javascript
• node.js
• react
• redis
• typescript