While there isn't a single Hacker News-like forum specifically for game development, some valuable communities and resources include:

1. GameDev.net for general discussions and industry news.
2. Newgrounds for indie game development.
3. Unreal/Unity forums for engine-specific technical discussions.
4. Gamasutra (now GameDeveloper) for postmortems and industry insights.
5. Discord for more real-time, albeit fragmented, discussions.