Kakurasu Techniques

Five techniques solve every Kakurasu on PeerPuzzles. Learn them in this order: the first three settle squares without listing anything, the fourth is the general method behind them, and the fifth is what keeps a solve moving. Each page shows the technique on single rows, then on the same 7×7 puzzle, so you can see what each one adds.

For all five in one place with a full worked puzzle, see how to solve Kakurasu.

Guides

Kakurasu One-Way Targets: Where to StartFive targets in every Kakurasu can only be made one way: 1, 2 and the three largest. Here's why, what each one fills in, and how to use them first.
Kakurasu Too-Big Squares: Cross Them Out FirstAny Kakurasu square worth more than what's left of its target can't be shaded. How to spot too-big squares, use them on what's left, and sweep a grid.
Kakurasu Big Targets: Count the Empty SquaresBig Kakurasu targets are small targets for the empty squares. Learn the count, the squares it shades, and why it's the same as 'can't do without it'.
Kakurasu Combinations: Find the Shared SquaresList the ways a Kakurasu target can be made, then shade what they all use and cross out what none use. The general method behind every other technique.
Kakurasu Crossing Lines: Cut the CombinationsEvery square you settle in Kakurasu cuts the combinations of the line crossing it. How a single cross can take a line from five combinations to one.