Calcudoku

How to play

Fill the grid so that every row and every column holds each number from 1 up to the grid's size exactly once. The heavy lines split the grid into cages. The clue in a cage's corner is a target and an operation: the numbers in the cage must add up to it (+), multiply to it (×), or, in a two-cell cage, differ by it (−) or divide to it (÷). A cage with no sign is just its number. A number may repeat inside a cage, as long as not in the same row or column. The puzzle is also called Mathdoku.

Tap a cell, then a number; switch on Notes to pencil in candidates instead.

Shortcuts

• Arrow keys move, number keys place a number, Shift + number writes a note.
• N toggles notes, Z undoes, Y redoes, H asks for a hint.