Sudoku

The grid has 81 cells split into nine three-by-three blocks. About thirty digits are already placed: fill in the rest so that each digit from 1 to 9 appears exactly once in every row, every column and every block. Today’s grid has a single solution. Every digit you place is checked right away: if it is right, it locks in place for good; if it is wrong, it disappears, stays marked as impossible in its cell and costs you a life. You get 3 mistakes at most. Tap a digit to see every cell where it is already placed. A tip: start with the digits that already appear most often, then look in each block for the only cell where a digit can go. For example, if a 7 already sits in two rows of a band of blocks, the third 7 has only one row left. The grid changes every day at midnight (UTC) and is the same for everyone. Two ways to play Sudoku: the daily challenge, the same puzzle for everyone, renewed every day at midnight (UTC), one game per day, with a day streak and coins to win; and free play, unlimited, where a new puzzle is drawn for every game, with no reward, so you can practise as much as you like. In free play, the solution is always shown at the end.