Play Nim, Kayles and a subtraction game in the browser, in normal or misere play, against a perfect opponent - with a Sprague-Grundy lens that collapses any position to the single Nim heap it equals. Independent reimplementation; theory after C. L. Bouton (1901), Kayles after H. E. Dudeney (1908) and Guy & Smith (1956).

Every public app is built from a security-scanned skill and must pass a clean scan — skill and frontend — before it can be listed. Have a skill of your own? Turn it into an app — or read the step-by-step walkthrough.