Logic LabCross Sums
Cross Sums
Also known as Kakuro. Choose your challenge – every run must hit its target.
Beginner
Compact 4×4 grid with runs up to three cells. A first taste.
4×4 grid·~7 cells to fill~3 minutesStart BeginnerEasy
6×6 grid with runs up to four cells. A gentle introduction.
6×6 grid·~16 cells to fill~7 minutesStart EasyMedium
8×8 grid with runs up to five cells. A steady challenge.
8×8 grid·~30 cells to fill~15 minutesStart MediumHard
10×10 grid with runs up to six cells. For seasoned solvers.
10×10 grid·~50 cells to fill~30 minutesStart HardMaster Mind
A sprawling 15×15 grid with runs up to seven cells.
15×15 grid·~120 cells to fill~45 minutesStart Master Mind
?How to play
- 1Fill every white square with a digit from 1 to 9.
- 2The shaded squares with a diagonal line give you the targets. The number in the top-right is the total for the white squares running to the right. The number in the bottom-left is the total for the white squares running below.
- 3A digit can't appear twice in the same run, but it can show up again in a different run.
12
5
9
5
4
8
7
1