If you like the challenge of Sudoku or Shikaku, you will love Kuromasu! Kuromasu is a number logic puzzle created by Nikoli, the Japanese publisher that made Sudoku popular. Kuromasu is also known as 'Where Is Black Cells' and 'Range', is almost similar to other logic puzzle like Sudoku, Shikaku or Kakuro. The objective of this game is to find the black cells.