Welcome to Hirofumi Fujiwara's Homepage
What's New (14/Nov/2014)
Thank you for visiting my English Homepage.
My Japanese Homepage is very huge (more than 4,000 files, 40MB),
and very famous among computer scientists and puzzle lovers in Japan.
Total hit count from the opening(Aug/30/1995) exceeded 100,000,000.
Puzzle Generator Japan (New Site! -- My Job)
World Fastest Problem Generator
Automatic Puzzle Generator: Number Place(Sudoku)
generating 1 question in 0.05 seconds
Automatic Number Place (Sudoku) Problem Generator Version 2.0
makes you possible to create 17-clue problems!
You will be able to enjoy Number Place Problem Generator on
Nintendo DS soon.
The product name is "MUGEN (infinity)"
searched by Google.
Our problem generator engine is installed in this product!
I want to know the history and origin of each puzzle.
Who invented thepuzzles, when, where, etc.
Are there any useful homepages on the WWW?
How to fold (YouTube)
How to make Crane Base
How to make Crane
Origami Professor, University of Tsukuba
Japanese Culture Links
CDJapan(japanese music, japanese anime,... )
Karakuri Creation Group
Japan Toy Museum
the Hidden Realities of
Computer Industry in Japan
Please send any feedback to
This page is link free.