Dev rebuilds Pokémon Red in 2.5D from his own ROM cartridge using an agentic workflow
NathanWilbanks_ · x · 2026-11-10
Tired of playing Pokémon Red the usual way, the author rebuilt the entire game in 2.5D running from his original ROM cartridge, and shared the full recipe:
- Used @agntgg as the main agentic workspace for automated research, coding, and asset building
- Decoded the raw ROM's maps, collision, text, trainers, wild tables, sprites, music, cries and move sounds to WASM
- Turned all 224 decoded map areas into three.js levels
- Wired doors, NPCs, gyms, the Elite Four, legendaries and HMs into story scripts
- Rewrote the gen 1 battle engine plus party/pokedex/PC systems in plain JS
- Converted the ROM's music to MIDI, replayed with harps, strings and hand drums
- Bundled with esbuild into one gzip-packed HTML file
- Verified autonomously with puppeteer playthroughs in Chrome to catch bugs
He's considering a generic ROM mod layer that applies these mods in real time on your own official ROMs — fully legal and potentially sellable mods.
Related event: Developer Rebuilds Pokémon Red as 2.5D Web Game Using Agent Workflows(2 posts)→
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