Play it
Choose who starts, answer under the clock, and see how far you can get before a mistake.
A classic sequence, made playable
Take turns against a computer that never slips, chase the top 25, then look under the hood at the tiny problem that has become a surprisingly durable coding prompt.
Sequence preview
Choose who starts, answer under the clock, and see how far you can get before a mistake.
Skimmable rules explain factors, multiples, and the answer pattern without assuming code knowledge.
Compare clean FizzBuzz implementations in JavaScript, Python, and Go.