Numbers · Addition
Cross Sums
A crossword made of sums — every run of numbers adds up to its clue.
About Cross Sums
Cross Sums (Kakuro) is a number crossword: every run of white cells adds up to the clue beside it, and digits cannot repeat within a run. Learning the unique combinations makes it flow.
Play a new daily puzzle every day, or pick Easy, Medium or Hard in practice mode for unlimited puzzles.
How to play
- Fill white cells with 1–9.
- The number above a diagonal is the sum of the run to its right; below is the sum of the run beneath it.
- Numbers cannot repeat within a run. Some numbers are given; unique solution.
Tip: two cells summing to 3 must be 1+2; three cells summing to 24 must be 7+8+9.
Select a white cell and enter 1–9. Repeats or wrong sums turn red.
Tips & strategies
- Two cells summing to 3 must be 1 and 2; to 17, 8 and 9.
- Three cells summing to 6 must be 1, 2 and 3; to 24, 7, 8 and 9.
- Where two runs cross, the digit must fit both.
FAQ
How do you play Cross Sums?
Fill white cells with 1–9. The number above a diagonal is the sum of the run to its right; below is the sum of the run beneath it. Numbers cannot repeat within a run. Some numbers are given; unique solution.
Is there a new Cross Sums puzzle every day?
Yes. A new daily puzzle arrives at midnight (your local time) and everyone gets the same one. Missed days can be played from the archive.
Do I need to sign up or install anything?
No. Daily Brain runs in your browser. You can add it to your home screen and it keeps working offline after the first visit. Progress is stored only on your device.
Are there difficulty levels and hints?
Practice mode offers Easy, Medium and Hard with unlimited new puzzles. Hints are available when you get stuck and are recorded in your result.