Think Dojo

Original logic and math puzzles for curious adults, from the history of Japanese mathematics.

What we make

Think Dojo is a YouTube channel and newsletter. Each episode takes a puzzle from Edo-period Japan — the wooden puzzle tablets called sangaku, the best-selling arithmetic book Jinkoki, and more — and solves it step by step. Every answer is checked by code before it is published.

Where to find us

About the "Think Dojo Uploader" app

Think Dojo Uploader is a private tool used only by the channel owner to upload videos, add captions and titles, and read analytics for the Think Dojo YouTube channel. It is not offered to other users. See the privacy policy.