Puzzles

• Mad Professor?
• Points on a unit circle
• Nim
• Kontsevich’s puzzle
• Matrix
• Chessboard 1
• Chessboard 2
• 100 prisoners problem
• Countable prisoners problem
• Dobble
• Tile 1
• Tile 2
• line and point
• 111111…….
• Zagier’s one sentence proof
• Lights Out game
• Three utilities problem
• 1 + √2
• Box in box

Reference of Puzzles

• Peter Winkler Mathematical Puzzles
• Anany Levitin, Maria Levitin Algorithmic Puzzles
• Takehiko Yasuda Introduction to University Mathematics through Games (in Japanese)
• Proofs from THE BOOK
• Ebima Lab’ YouTube video
• 3Blue1Brown
• TED-Ed: Can You Solve This Riddle?

Math Puzzles by Others

• Martin Deraux
• Shuho Kanda
• Junnosuke Koizumi

Others

Geometry Paper Digest

I created Geometry Paper Digest, a website where I summarize papers that I find interesting in Japanese with a lot of help from ChatGPT.

Photo

• My Laboratory (since 2026/03)
• My Laboratory (before 2025/08)
• My Laboratory (before 2025/06)

Programming

• Game of Life
• Various sorting