OML-IZ Search

Range (Kurodoko)



Color some squares black, so as to meet the following conditions:

  • Numbered squares may not be black.
  • No two black squares are orthogonally adjacent.
  • No group of white squares is separated from the rest of the grid by black squares.
  • Each numbered cell can see precisely that many white squares in total by looking in all four orthogonal directions, counting itself. (Black squares block the view. So, for example, a 2 clue must be adjacent to three black squares or grid edges, and in the fourth direction there must be one white square and then a black one beyond it.)

Left-click to color a square black. Right-click to mark a square with a dot, if you know it should not be black.

Courtesy of Simon Tatham's Puzzle Collection via the MIT license.


We hope that the free math worksheets have been helpful. We encourage parents and teachers to adjust the worksheets according to the needs of the child. For more difficult questions, the child may be encouraged to work out the problem on a piece of paper before entering the solution. We hope that the kids will also love the fun stuff and puzzles.

We welcome your feedback, suggestions, comments and questions about this site; please submit your feedback via our Feedback page.

OML-IZ Search
Share this page Facebook Page