Is there another name for this type of puzzle? I can only find two examples of it online:

In the game you start with a 6x6 grid filled with the numbers 1 to 9. One number on the grid is circled. The aim is to remove numbers (you can't remove the circled number) so that:

  • The sum in every row and column is 9 or less
  • Each number (1 to 9) appears only once

For example, you might start with this grid: enter image description here

And remove all of the number 5's except for the one that is circled: enter image description here

You can then remove the numbers 7, 8 and 9 from column 3 because, when added to 5, the answer is greater than 9. And so on, until you end up with a grid that looks like: enter image description here

  • $\begingroup$ FWIW, googling "九独" (kyudoku in Japanese) doesn't return any puzzles... $\endgroup$ – Andrew T. Sep 26 '19 at 7:22
  • $\begingroup$ Thanks for checking $\endgroup$ – Rory Sep 26 '19 at 19:31

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