Make a 3D shooter for 20-year-old phones in one prompt

Opus 5.5 wrote an integer-math Java engine, its own sprite renderer, 4 maps, 8 MIDI tracks and TTS voice lines.

by /u/wollymonjac8 Oct 2026

Prompt for your agent

Goal: Build a retro 3D shooter for old J2ME phones.
Setup: agents used in source: Claude; tools/MCPs stated: ffmpeg, J2ME.
Steps:
1. Ask for a Duke Nukem 3D-style shooter for old J2ME phones.
2. Expect an integer-math 3D engine in Java so old phones can run it.
3. Let it write its own 3D renderer in Python to model and render sprites; generate textures and skies in code.
4. Have it design maps, compose MIDI tracks, and make voice lines with TTS edited via ffmpeg.
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.
Based on: /u/wollymonjac — https://www.reddit.com/r/ClaudeAI/comments/1x120gj/opus_55_can_make_games_for_2_decade_old_phones/

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

I tried this

Tell the next builder. One anonymous answer each; click again to undo.

Agents, models and tools only what the source states

Agents
Claude
Models
Opus 5.5
Tools
  • ffmpeg
  • J2ME

Sources & credit