On this page, you see a puzzle on a 16x16 board for advanced and professional sudoku players. A grid contains four 4x4 blocks. You can solve it like a regular sudoku puzzle. This online game is free and also works on desktops, tablets, and smartphones. Recommended for travellers on public transport, for those who are waiting or just needing headwork or just solve logical puzzles, and for those who need culturally useful developer fun.
If you don’t want to measure time, you can turn it off with 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 fields, press the "I'm ready" button! It will allow you to check that you have worked well. Pressing the "new game" button will clear the numbers you have entered so far and gives you a new board.