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Development Notes from xkcd's "Machine"
How we designed xkcd's massive rube goldberg machine game in 3 weeks.
Kevin’s map generator transitions from simple single-input single-output puzzles to complex 4-in-4-out merges in the middle, back to 2 outputs per tile at the end. To pretend there’s more machine up above the view, balls are created and fed to the tiles at the top row of the simulation (based on the expected rate of their input constraints). Rapier was fantastic to work with: it has great docs, a clean API with lots of useful primitives, and has impressive performance thanks to its Rust implementation (running as WASM in the browser).
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