Calcudoku

How to play

1. Use each of the shown digits once in every row and column. Select a cell and use the number buttons or your keyboard; arrow keys move the selection, and Erase, Backspace, or Delete clears it.
2. Use Notes (or N on the board) to save possible digits. Notes are not correctness hints. Entering a number clears its notes and removes that digit from other notes in its row and column.
3. The digits in each cage must produce its target using the shown operation. For subtraction and division, either order is allowed. A cage without an operation contains its target digit.
4. Repeating a digit in a row or column is rejected. Accepted entries do not confirm cage correctness; the puzzle completes when the whole grid satisfies all its rules.

Daily challenge

Everyone gets the same daily challenge for the UTC date. Your saved attempt resumes when you return; the next challenge arrives at midnight UTC. Daily results do not change Elo.