MathDoku
Arithmetic cages, one number per row and column
Use each number once in every row and column. Each outlined cage must reach its target.
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Arrow keys move. Type a number to enter it. P toggles pencil marks. Delete erases. Ctrl or ⌘ Z undoes; Shift Z redoes.
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How to play
Fill each row and column with the numbers 1 to the board size, using each number once. Numbers in a cage combine with its marked operation to make the target. For subtraction and division, use the larger number first. A single-cell cage gives its number.
Pencil marks help you track possibilities. A ! marks a row, column or completed cage conflict. Solve reveals the answer; it does not count as a win.
Puzzle engine: Simon Tatham’s Keen. MIT license and credits.