Hi Product Hunt, I’m Wayne, the maker behind PlayMerge.ai — a code review game I vibe coded to help developers sharpen their merge instincts in under 5 minutes a day. Also, as a Convex.dev demo app. Here’s what PlayMerge does: PlayMerge gives you real pull request diffs from real codebases. Some were approved by humans. Others were AI-generated. Your job? Decide whether you’d merge or reject — and see how your instincts stack up. It’s fast, fun, and a surprisingly addictive way to train your eye for clean, safe code. Great for: • Developers who want to practice reviewing code across stacks • Teams running internal challenges or code quality tournaments • Engineers prepping for technical interviews Why I built it Code review is one of the most important—and under-practiced—parts of being a developer. I wanted to learn to build more apps through vibe coding with Convex and make a fun game for developers to play.. Just click, read, decide, and learn. What’s new with the launch • New languages added: Java, C++, SQL, and Go • Scoreboards and difficulty tiers are live • Snippets are now AI- and human-authored so you never know what’s coming I'm excited to see how the developer community uses PlayMerge. Whether you’re a junior dev looking to improve fast, or a senior engineer who wants a daily puzzle. I would love to hear your feedback. Thanks for checking this out. – Wayne, Head of Community and Startup Programs at Convex

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