Introduction to mountain sudoku
(Published on 20. February 2023, 00:58 by Nylimb)
Normal sudoku rules apply: Fill the grid with digits from 1 to 9, so that every row, column, and 3x3 box contains each of the 9 digits exactly once.
In addition, there is a mountain hidden in the grid. Its peak is at the 9 in the central box. The mountain consists of all cells which can be reached from the peak by repeatedly moving from a cell to an orthogonally adjacent cell containing a smaller digit. (See example below.)
Each cell which contains a triangle is in the mountain. Each cell which contains a circle is not.
You can solve this in Penpa or in the CTC-app.
Although this is my third mountain sudoku puzzle, it's intended as an easy introduction to the rule. Thanks to Allagem for suggesting that I make an easy one.
If you like this puzzle, you might also like my other mountain sudokus.
Solution code: Rows 2 and 8.
Comments
on 3. February 2024, 06:05 by thorscouts
We didn't one of the paths. Had to get a nudge from the creator. My son and I really enjoyed sitting down and solving this together!
on 17. March 2023, 03:22 by SimplePurpleFrog
I could not resist the appeal of the mountain.
An interesting constraint to work with, thank you.
on 24. February 2023, 00:11 by NIGHTCRAULER
Never done a mountain sudoku, took me a minute to figure out what to look for, but went smoothly once I did. Great intro to the concept :)
on 22. February 2023, 06:17 by Nylimb
Thanks to all for the nice comments.
on 21. February 2023, 06:20 by cmb
Wonderful introduction, thanks a lot.
on 20. February 2023, 18:16 by Phistomefel
The mountain condition is a very interesting concept and this is a lovely intro puzzle. Thanks, Nylimb!
on 20. February 2023, 15:29 by Allagem
Excellent intro puzzle! And nice innovation to use circles and triangles. I think the mountain concept is really interesting and this puzzle not only introduces the basic ideas really well, it's quite a fun solve too! I did end up at a logical contradiction 3 times in a row, so you do have to be a bit careful and make sure you really are considering all possibilities, but the solution is there and very clean. Highly recommend the puzzle!
@Allagem: I'm glad to know I'm not the only one who makes and repeats mistakes!
on 20. February 2023, 01:24 by Jesper
Good intro puzzle, will check out the others when I have some time :)
