Logic Masters Deutschland e.V.

• Dutch Flats: every 5 in the grid must have a 1 directly above it or a 9 directly below it. It may have both, but it doesn't need both.
• Chinese Whispers: adjacent digits on a line must differ by at most 2.

Hint

5 in box 1 has only one place to go. After that focus on box 1 - the 5-cell line that's sticiking out into box 4 puts a lot of pressure on high digits in box 1. R4c2 also has a tough time going in b1.

Previous puzzles in the Dutch Flat Mates series:

• #01 - 18 Oct 23 - Classic
• #02 - 25 Oct 23 - Thermometers
• #03 - 01 Nov 23 - German Whispers
• #04 - 08 Nov 23 - Region Sum Lines
• #05 - 15 Nov 23 - Sandwich Sums
• #06 - 22 Nov 23 - Little Killer
• #07 - 29 Nov 23 - Kropki
• #08 - 05 Dec 23 - Zipper Lines
• #09 - 12 Dec 23 - Renban - By GoodCity
• #10 - 19 Dec 23 - Nabner - By GoodCity
• #11 - 26 Dec 23 - Skyscrapers - By GoodCity
• #12 - 03 Jan 24 - Dutch Whispers
• #13 - 10 Jan 24 - Killer Cages
• #14 - 17 Jan 24 - Arrows
• #15 - 24 Jan 24 - Ten Lines
• #16 - 31 Jan 24 - 159 Index and Even - By GoodCity
• #17 - 07 Feb 24 - Friendly Cells
• #18 - 14 Feb 24 - Quads
• #19 - 21 Feb 24 - Silent Killer - By GoodCity
• #20 - 28 Feb 24 - XV and Equality
• #21 - 06 Mar 24 - X-Sums
• #22 - 13 Mar 24 - Numbered Rooms - By GoodCity
• #23 - 20 Mar 24 - Diagonal X-Sums
• #24 - 27 Mar 24 - Yin Yang (Neighborhoods) - By Palpot
• #25 - 03 Apr 24 - Hit Points
• #26 - 10 Apr 24 - Counting Circles
• #27 - 17 Apr 24 - XY Difference - By GoodCity
• #28 - 24 Apr 24 - Double Sandwich Sums
• #29 - 01 May 24 - Foggy Knights
• #30 - 08 May 24 - Look and Say Little Killer
• #31 - 15 May 24 - Slingshot - By GoodCity
• #32 - 22 May 24 - 258 Index and Odd
• #33 - 29 May 24 - Rellik
• #34 - 05 Jun 24 - Search 9 - By Palpot
• #35 - 12 Jun 24 - Diagonal Outside
• #36 - 19 Jun 24 - Entropic Snake - Collab with Palpot
• #37 - 26 Jun 24 - Rossini - By GoodCity
• #38 - 03 Jul 24 - Pointer Arrows
• #39 - 10 Jul 24 - Same Difference - by Marty Sears
• #40 - 17 Jul 24 - Battenburg and Average Arrows
• #41 - 24 Jul 24 - Omnipotent Lines - by Sujoyku
• #42 - 31 Jul 24 - Modular Snake
• #43 - 07 Aug 24 - Hot and Cold Lines - by Marty Sears
• #44 - 14 Aug 24 - Minmax Quads - by Sujoyku
• #45 - 21 Aug 24 - Quad Sums - By GoodCity
• #46 - 28 Aug 24 - Entropic Whispers - by gdc
• #47 - 04 Sep 24 - Thripper Lines
• #48 - 11 Sep 24 - Index Lines - by Marty Sears
• #49 - 18 Sep 24 - Kroopki Doots - by Damo_89
• #50 - 25 Sep 24 - Frameless / X-Less X-Sums
• #51 - 02 Oct 24 - Full Rank - By GoodCity
• #52 - 09 Oct 24 - Japanese Sums
• #53 - 16 Oct 24 - Chaos Construction Shifter - Collab with Palpot
• #54 - 23 Oct 24 - Ten or Eleven - By Marty Sears
• #55 - 30 Oct 24 - Split Peas - By SamuPiano
• #56 - 06 Nov 24 - Zombie (Cages) - Collab with Palpot
• #57 - 13 Nov 24 - Sharing Cages - by Sujoyku
• #58 - 20 Nov 24 - Domino Flat Mates - by Prof.Dori
• #59 - 27 Nov 24 - Circuit Board
• #60 - 04 Dec 24 - Double Arrows