Reverse engineered the C64 strategy game Weltendämmerung and ported it to the web

by Sebastian MackeRead the writeup Repository

Weltendämmerung: preview from github.com/s-macke — Image: github.com/s-macke

What was done

Claude Code with Opus 4.5 disassembled the 7 KB 6502 binary, documented its map, units, combat and save format, and built a playable TypeScript web port from that spec.

Where the human stepped in

Claude misidentified forest tiles, extracted all tiles in grey, invented 'towns' where the game has gates, and missed a variable used as both number and flag. The author kept sessions short and forced re-checks.

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Games and modsWorksSource available

Target: Weltendämmerung

Reverse engineered the C64 strategy game Weltendämmerung and ported it to the web

by Sebastian MackeRead the writeup Repository

What was done

Claude Code with Opus 4.5 disassembled the 7 KB 6502 binary, documented its map, units, combat and save format, and built a playable TypeScript web port from that spec.

Where the human stepped in