Sudoku-kun + is an application that allows you to play number places with more than 3000 questions according to the difficulty level. It was significantly updated in May 2022, and in addition to being able to play thumb cloth (addition cloth), it has a large number of functions as follows. Functions list -Temporary placement (9 pieces) function. -Fixed placement function (fixed by time, prevention of erroneous operation). -A function that makes the same number as the selected number stand out