Let Claude Code build a full Minecraft mod for 54 hours

Goal: See how far a long unattended agent run can take a game mod.
Setup: agents used in source: Claude; tools/MCPs stated: NeoForge, ElevenLabs.
Steps:
1. Give Claude Code the idea (here a new dimension in four layers, each ending in a boss) and let it run.
2. Let it write the design doc, then the code, models, animations and boss AI.
3. Have it build its own test harness: a hidden game client that plays the mod, takes screenshots and checks its work.
4. Hand heavy lifting to subagents with the main session reviewing their work.
5. Have it check generated voice lines by transcribing them back.
Rules: ask me before anything irreversible (sending, posting, paying, deleting); don’t invent data, results or tools I haven’t given you; tell me what you couldn’t verify.
Note: The author was on a Max plan; $2,032 is what the usage would have cost at API prices.
Based on: /u/Bonelessgummybear — https://www.reddit.com/r/vibecoding/comments/1wuh0nz/i_let_opus_55_run_for_54_hours_straight_and_it/

Steps are from the source. Includes a “Based on” credit line.