Spiral Stumper Series is a $5$-puzzles series taken from the Final Round of a local (national) contest, KPK, which has been ended recently and authored by me. The theme is spiral and each puzzle is standalone (there will be no meta, etc.)

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Ripple Effect (taken from Nikoli)

  • The areas divided by bold lines are called "rooms". Fill in all empty cells with numbers under the following rules.
  • Each room contains consecutive numbers starting from 1 (to $n$ where $n$ is the area of the room).
  • If a number is duplicated in a row or a column, the space between the duplicated numbers must be equal to or larger than the value of the number.

1 Answer 1


Finally, after some hard work (and some luck...)

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  • $\begingroup$ Yep, that's exactly right, well done! :D $\endgroup$
    – athin
    Sep 29, 2019 at 7:44

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