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Play Kakurasu with the rules at hand

Bring this focus to a round

The example and rules describe the same game you can play above. Tap cells to mark or clear them. Current totals are displayed alongside the target totals. Try the rule on the board, then read the next instruction.

The challenge in front of you

The example and rules describe the same game you can play above. Mark cells so every weighted row total and column total matches its clue. Start a new round when you are ready to try again.

The steps to play

  1. A 5×5 grid shows target sums at the right and bottom.
  2. A marked cell contributes its column number to its row sum, and its row number to its column sum.
  3. Tap cells to mark or clear them. Current totals are displayed alongside the target totals.
  4. Match all rows and columns to complete the puzzle. Each generated puzzle is checked to have one solution.

Controls

Check the rule below as you play. Tap a square to mark or clear it. Undo restores the last state. New puzzle generates another checked board.

See how the rules apply

Check the rule below as you play. Marking columns 2 and 5 in the same row gives that row a total of 7. A mark in row 3 contributes 3 to its column. Keep the goal in mind before your next move.

Notice this detail

Keep the goal in view while choosing a move. The value is the position in the row or column, not a uniform count of marked squares.

If you are unsure

When I start, what is the aim of Kakurasu?

Mark cells so every weighted row total and column total matches its clue. The worked example offers another way to follow the rule.

During a round, how do the controls work?

Tap a square to mark or clear it. Undo restores the last state. New puzzle generates another checked board. The instructions above use these same rules.

On this page, can you show an example?

Marking columns 2 and 5 in the same row gives that row a total of 7. A mark in row 3 contributes 3 to its column. A new round resets the current game.

When I start, which mistake should I avoid?

The value is the position in the row or column, not a uniform count of marked squares. The worked example offers another way to follow the rule.

For this game, what rules and limits are used here?

Generated 5×5 puzzles with an exact row-mask search for uniqueness before publication to the board. No calibrated difficulty labels. Use the labelled controls for your next action.

How many people can play here?

Solo. This is local browser play, not internet matchmaking. The controls work with mouse or touch.

During a round, what does a marked square contribute?

Its column number to the row total, and its row number to the column total. Use the labelled controls for your next action.

For this game, why can row and column contributions differ?

A square in row 2, column 5 contributes 5 to its row and 2 to its column. Use the labelled controls for your next action.

On this page, does each generated puzzle have one solution?

The generator searches the row-mask combinations and only accepts a puzzle with exactly one solution. The worked example offers another way to follow the rule.

On this page, can I clear a square?

Yes. Tap a marked square again, or use Undo. Scores here do not represent cash or prizes.