I can provide you original cool problems
for your newspaper, book and etc.
Do you want to know how I made these problems?
Kobito-san made all problems on this page for me.
I'm sure Kobito-san uses a magic tool.
Kobito-san uses this tool (left photo).
Press Conference on September 6 at Akihabara
Number Place Vol. 3
problmes with 19 and 18 clues