A One-Prompt Spearfishing Game on Opus 5.5, Costing 16% of a ¥3000 Plan
EricBuess · x · 2026-09-25
Japanese developer @nachatdayo built a playable spearfishing game as a Claude artifact with Opus 5.5: one prompt did almost everything, followed by about 30 minutes of bug fixes and tuning, consuming just 16% of a ¥3000/month Claude plan.
What struck him most wasn't the speed but the feel — the game came back tuned to a difficulty that was actually fun to play.
More from coding & agent
- Talk preview: agentic coding accuracy drops from 80% to 38% on real codebases — sanjaykalra · 2026-09-25
- CLion 2026.2.3 adds NVIDIA CUDA Tile C++ support with dedicated inspections — blelbach · 2026-09-25
- User urges AI bot to open MCP access: container computer-use is its killer edge — doooyle · 2026-09-25
- Developers push back on 'ship faster': slow iteration and AI as a canvas — davidfromkansas · 2026-09-25
- What quantization actually does to models, and why Q2 breaks your agent — nickbaumann_ · 2026-09-25
- Three frontier models recreate Zelda: Ocarina of Time demo from scratch in one week — ChrisGPT · 2026-09-25