Diagonal Sudoku

A 9x9 grid sets the rules here. In Diagonal Sudoku, the usual Sudoku layout of 81 cells gets one extra condition on top of the standard pattern. The two main diagonals also take digits 1 through 9 without repeats, alongside every row, each column, and every bold 3x3 box. Green marks show those diagonal lines on the board. That added restriction cuts down the available placements, which makes this puzzle format easier to read than regular Sudoku for many players. More than 300 boards are included, and four difficulty settings let intermediate Sudoku fans pick a pace that fits.

How to play?

Fill the empty cells with digits from 1 to 9, placing each number only where the board rules permit it. Use save and load to pause a puzzle and return later, even after a long break. Print any current board onto paper when you'd rather solve away from the screen. A partially finished grid prints with the numbers already entered, so the same puzzle can continue on paper from that exact point.