It is a shogi problem for smart phone.
There are 50 questions in all.
It is for beginner shogi players.
a person with the title 'dan' in Shogi who is going to end the answer by 20 minites.
The app is all in Japanese, but it's intuitive enough that English or other language speakers can understand it. Kept me occupied for a little while, what more can you ask of a free app!