Claude Opus 5.5 built a 3D version of a Terraria-style game in eight days, with the creator writing none of the code themselves.
→ The post says the game has 346,000 lines of C# running on a custom engine, not Unity or Godot
→ It claims 3,369 items and 313 enemies and bosses
→ The original creator and any code repository have not been publicly identified in the post
→ Terraria is owned by Re-Logic, and the project is not an official release