ChillerenCross sums

Cross sums

Fill the white squares with the numbers 1 to 9 so every sum adds up and no number repeats within a sum.

Today's puzzles

7 × 7
Bus
10 × 10
Coffee Meeting
13 × 13
Train
How to play

Fill the white squares with the numbers 1 to 9. A sum is a row or column of white squares, and it must add up to the number in the dark square before it: across is the number at the top right, down is the number at the bottom left.

The same number cannot appear twice in one sum.

Tap a white square, then tap a number at the bottom. Tap the same number again, or Clear, to remove it. Squares with a fixed number stay as they are. On a keyboard, the arrow keys move between squares, a number key places that number, and Backspace removes it.

A selected square lights up its two sums and shows at the bottom what they add up to and how many squares they have. A sum that adds up gets a quiet colour. A sum that can no longer add up turns red: a number repeats, the numbers are too high, or the sum is full and too low. Check marks the sums that break a rule or still miss numbers, and the leaderboard counts your checks.

Achievements
Without a check, not earned yetWithout a checkSolve a Cross sums puzzle without pressing Check.
The full ledger, not earned yetThe full ledgerSolve a 13 × 13 Cross sums puzzle.
Every size, not earned yetEvery sizeSolve a Cross sums puzzle in every size: 7 × 7, 10 × 10, and 13 × 13.

You collect achievements when you join the leaderboard with a result.