Building breakable cities with Opus 5.5 — open-source and playable now

smith2008 · reddit · 2026-10-22

Reddit user smith2008 showcased a 'breakable cities' simulation built with Claude Opus 5.5, calling it genuinely fun to play with.

The code is open-sourced on GitHub (kchernev/breakable.js), so anyone can try it out or hack on it — another example of frontier models one-shotting fun simulators.

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