Curling in the browser in real 3D, on a sheet built to the World Curling Federation's published feet and inches: 114 ft tee to tee, hog lines 21 ft in front of each tee, a twelve-foot house and a 142 mm stone. The stone slides under a friction law measured on pebbled ice, and because why a stone curls is genuinely unsettled in the physics literature, the app ships three competing mechanisms and shows what each one predicts rather than picking a winner. Eight-stone ends, the hammer, the five-rock free guard zone and the no-tick rule, implemented by clause. No sign-in, nothing billed, no model.

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