脳トレパズル

■ What is Sudoku?

This is a game in which numbers 1 to 9 are placed vertically and horizontally on a 9x9 square board without duplication. Also known as Sudoku.

■ What is Kanji Nankuro?

Nankuro is a crossword puzzle with no hints. Among them, the one limited to Chinese characters is called Kanji Nankuro.

■ What are four arithmetic operations?

This is a puzzle that uses +-× ÷ to make a total of 10 4-digit numbers.

■ About the number of problems

Includes over 700 questions.