Stone Skipping in your browser: throw a flat stone across a quarry pool and watch it skip under the collision physics of Clanet, Hersen & Bocquet (Nature 427, 29, 2004) and Rosellini, Hersen, Clanet & Bocquet (J. Fluid Mech. 543, 137, 2005). Every throw is scored two ways at once, because the two traditions disagree about what is measured: the World Stone Skimming Championships (Easdale Island) judge distance with a two-bounce minimum, the Mackinac Island competition judges the skip count. A magic-angle lab tests the published 20-degree optimum. An independent reimplementation; no library, no model, no credits.

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