A solo builder says he made a local fishing game with Claude Opus 5.5 and Unity 6 by never asking for "a fishing game": one piece at a time (greybox, core mechanic, models via Tripo + Blender, lighting last), then an autopilot playtest writes the bug list. Beach, pier, day/night cycle in a single project. Prompt-by-prompt game dev is getting real. Credit: @sorenxet https://x.com/sorenxet/status/2111583999294398792/video/1