Get the only solution to the newdoku puzzles by thinking logically without guessing.
Diagonal Sudoku (X Sudoku) are like regular Sudoku puzzles but with two extra groups. Not only do you have to put the digits from 1 to 9 in each cell of each row, column, and 3×3 square, but you also do that for the two diagonals.
Each step is saved automatically. If you feel you've made a mistake, click on the "Undo" or "Redo" to return to a certain step and continue. If you click on the "Reset", it will clear all the saved steps and start from the beginning.
"Reset" icon: this will clear all input (pen and pencil marks) displayed in the grid.
The game is auto-saved on exit, so you can come back to continue.
"Pen" mode: You can click on the "Pen" icon to switch between pen and pencil modes.
"Pencil" mode: jot down ideas you have for possible keys. You can click on the "Pencil" icon to switch between pen and pencil modes.