This is a standard Sudoku, except that the numbers 1 to 9 also appear on the main diagonals. Any advantage this might give the solver is counterbalanced by fewer starters.
Each puzzle is available to play online for two weeks from its date of release. When playing:
Click on Help for full guidance on playing the puzzle online, including when to use the Reveal/Verify and Assist functions.
Press Reset to empty the grid of all placed digits except those that have been revealed/verified.
Use Save to store a partially solved puzzle.
Press Submit when you’ve completed the puzzle.