The grandmaster's grid

Once you press Start you have 25:00. One play per device, and the clock never stops.

Timed challenge⏱ 25:00

⏱️ One hard sudoku, twenty-five minutes.

🧩 Every row, every column and every 3x3 box holds 1 to 9 exactly once.

🧠 No guessing needed: pure logic gets you there.

Tap a cell, then a digit. Fill every cell.

💡 Hint: Hunt for a cell with only one possible digit, or a digit with only one possible place in a box. Then repeat.