X-Sudoku, also known as Diagonal Sudoku, is another type of 9x9 Sudoku. Based on the regular Sudoku, Diagonal Sudoku has additional requirements. The two grey diagonal lines must contain all numbers from 1 to 9. Since X-Sudoku has more rules, the solving process is more challenging and intriguing.
Practice scanning the diagonals regularly, in addition to the rows, columns, and blocks, to help make progress. This is the key difference between X-Sudoku and regular Sudoku.
If you do not want to keep track of time, you can turn it off using the small "x" next to the clock. You can adjust the size of the Sudoku board by selecting small/medium/large. When you have filled in all the squares, press the "I'm ready" button to check your work. Pressing the "new game" button will clear the numbers you have entered so far and give you a new board.
This online game is free and also works on smartphones. It is recommended for travelers on public transport, those who are waiting, or those who want to challenge their minds with logic puzzles. It is also culturally useful and fun for developers.