Updated Every day | I'm a Himitsu-bako craftsman – Hiroyuki Oka
Blog about Making Japanese puzzle box and its culture
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My works

What Is Needed for Production

Today is Monday, but it is a national holiday in Japan. It is called Marine Day and is a relatively new holiday that was...
2026.07.20
My works
Japanese culture

Rising Material Costs and Their Impact

Today was another very hot and humid day. It seems that thunderstorms occurred in many places during the afternoon. I al...
2026.07.17
Japanese cultureMy works
My works

Wood for Small Mechanisms

Today was another hot day. I had planned to continue working on the 3-sun puzzle boxes, but since I thought I might have...
2026.07.16
My works
My works

Differences in How It Is Attached

Today was another very hot day. The rainy season has not ended yet, but it already feels completely like summer. I conti...
2026.07.15
My works
My works

Skill in Applying Glue

Another very hot day continues today, with the temperature rising above 30°C. The end of the rainy season was announced ...
2026.07.14
My works
My works

The Fit of the Top Panel

It is a new week, and I am continuing the production of the 3-sun 12-step puzzle boxes. Today, I attached the top and bo...
2026.07.13
My works

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Hiroyuki Oka
Hiroyuki Oka

Hi there. I am a Japanese puzzle box craftsman. I have been making puzzle boxes for 30 years.

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Blog about Making Japanese puzzle box and its culture
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