Logic Masters Deutschland e.V.

Cake by the Lake

(Published on 20. July 2024, 00:00 by marty_sears)

Happy birthday to Lake, a fantastic setter and top bloke, who I am actually gonna meet in person today for the first time :) This puzzle is also in response to a prompt from gdc to set something with shaded cells that all act as some kind of modifier.

Rules:

  • Normal sudoku rules apply.
  • Colour some cells green (land) and some cells blue (lake). All cells of the same colour must be orthogonally connected. A 2x2 area may not be all land, but it might be all lake.
  • LAKE: Lake cells must not touch the edge of the grid. The value of a lake cell equals its row number plus its column number, regardless of what digit appears in that cell. Eg: If r4c2 is lake then its value is 6.
  • CAKES: The value of a cake cell indicates exactly how many cakes have that value.
  • SAME DIFFERENCE: Adjacent values on a turquoise line always have the same difference. This difference must be determined for each line.

Click here to play on the CTC app

Please leave a comment if you enjoy :)

Solution code: row 5 from left to right

Last changed on on 20. July 2024, 02:27

Solved by sorryimLate, vitaminz, Alce, juggler, bansalsaab, GorgeousNicko, by81996672, gdc, MSDOS, linl33, Vodakhan , lmdemasi, fractalminding, BHUNTER47, wuc, Franjo, SKORP17, karlmortenlunna, achim-t, ajc, ... ranalloatl2, Blug, sinamon, kdkirby, kevinlimanta, Chopper5, Nell Gwyn, FifthWorld, letmepuzzleffs, Ton, 3ColorTheorem, jakestilesowen, Firebird, Cyanogenoid, mir85, samjna0049, PippoForte, jwanders
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Comments

on 14. November 2024, 04:19 by jakestilesowen
I really like this puzzle and its different stages. Great setting!

on 9. September 2024, 13:40 by QuiltyAsCharged
Same difference lines
Shaded water and land
Work together so well
This puzzle is grand!

For Lake's birthday
A slice we will hoist
Of Cake by the Lake
So incredibly moist

on 14. August 2024, 22:51 by ChinStrap
Lovely! Now I want cake...

on 20. July 2024, 22:28 by ViKingPrime
The level of care and detail you put into your birthday puzzles is nothing short of remarkable. Phenomenal.

on 20. July 2024, 15:37 by Franjo
An extraordinary birthday present this is! Thank you so much for sharing this with us and: Happy Birthday, Lake!

on 20. July 2024, 15:25 by wuc
Awesome as always. I missread the rule that the border is all land... then its more complex :-). Rereading the rules made a lot suddently clear and 3 star is ok to me. What a joy solving thx once more.

on 20. July 2024, 07:46 by gdc
Very nice submission for the prompt. Liked the choice for shading rule and the modifiers. Also really cool interactions with the same difference lines.

on 20. July 2024, 03:02 by juggler
Beautiful logic in this one, as always! Really enjoyed that :)

on 20. July 2024, 02:23 by vitaminz
Quite a bit easier for me than the rating but might just be hitting my strong suits. Probably my favorite puzzle this month! Lots of deductions I wasn’t expecting when reading the rules.

Last changed on 20. July 2024, 02:04

on 20. July 2024, 01:58 by sorryimLate
Wow, that was super fun, fresh and clever! But definitely no more than 2* in my opinion. In mid-solve I thought I had broken it, but then noticed that I hadn't finished reading the sentence in the rules about 2x2. I had just assumed it's the normal yin yang.

Last changed on 21. July 2024, 00:57

on 20. July 2024, 01:16 by fractalminding
Perhaps you wanted to say that a 2x2 area can be completely land, but it cannot be completely water. Otherwise, I don't understand... After all, according to the rules, water can be in a very limited area of the grid. It must be an interesting sudoku. But I can't understand the rules yet...

Marty: No, a 2x2 may not be completely land. But it might be completely water. I'm not sure what you mean about water being in a very limited area of the grid? (to clarify, the value of a water cell does not necessarily equal the digit in the cell. So there might be a 7 in r1c1, but it would have a value of 2 rather than 7, for the purposes of the line its on.) Hope this helps?

Difficulty:3
Rating:95 %
Solved:80 times
Observed:9 times
ID:000IXK

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