Sums

How to play

Sums is a crossword of numbers. Fill every empty cell with a digit from 1 to 9. Each run of empty cells, across or down, adds up to the clue in the block before it: the across clue sits above the block's diagonal, the down clue below it. A digit never repeats within a run.

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

Shortcuts

• Arrow keys move, 1–9 place a number, Shift + number writes a note.
• N toggles notes, Z undoes, Y redoes, H asks for a hint.
• Your progress saves after every move — close the tab and come back any time.