SudokuFriend

This Sudoku puzzle creation enables a much faster process in figuring out a hard to very hard puzzle versus having to separately write on paper. I had a super-hard puzzle from The Week magazine that I know through the manual method would have taken an hour to solve. I solved the puzzle in half the time as it’s much easier to visually see all the possible numbers as well as patterns that helped me eliminate numbers within a row, column or box!

You should add ability to highlight all of pencil mark number when that number is selected. For example if I select no. 1, now all off numer 1 are highlighted but not pencil marks of numer 1 in all fields that I have possible 1s. Beside that, great app All the best from Serbia