Zip of the Iceberg
(Published on 3. December 2023, 20:47 by gdc)
This puzzle is similar to Tip of the Iceberg but uses Zipper Lines instead of arrows. It also features German Whisper Lines to create some interactions with high/low coloring. Another similar (but way more linear) puzzle is Lavender in the Fog. Thanks to the testers on the CtC-fan discord for testing and feeback!
- Normal Sudoku rules apply.
- The grid is covered in fog. Placing correct digits reveals clues in the surrounding 3 by 3 area.
- Rotational Symmetry: If the grid is rotated 180 degrees, the matching cells add up to 10 e.g. R3C2+R7C8=10.
- Digits an equal distance from the center of a lavender 'Zipper Line' sum to the digit in the middle of that line.
- Adjacent digits on a green German whispers line differ by 5 or more.
- All lines are exactly 5 cells long, only move orthogonally and don't share cells with other lines.
Click here to search for more Zipper Lines puzzles on LMD. If you've never solved a puzzle with this ruleset before, I'd recommend A Totally Balanced Approach as an introduction.
Solve Video
Click here to see Mark from CtC live solving this puzzle on YouTube.
Solution code: Row 1 (9 digits)
Comments
on 26. August 2025, 00:12 by Jrosas
Great setting. I found this searching old CTC videos.
on 27. March 2025, 00:03 by gdc
add link to solve video (YouTube)
on 18. December 2023, 02:29 by filz
Thank you, not easy, but really enjoyed it!
on 5. December 2023, 13:04 by madhupt
Very enjoyable puzzle! Thanks a lot for sharing this.
on 5. December 2023, 10:31 by GeorgeTheToad2
Nice combination. Thank you for sharing.
on 4. December 2023, 17:00 by One Eyed Man
Brilliant, just brilliant.
on 4. December 2023, 15:19 by Shuhua Milk
Absolutely stunning!
on 4. December 2023, 03:17 by Fisherman
GDC is one of the best teachers I have come across.
on 3. December 2023, 22:26 by ViKingPrime
I have no idea how you manage to put out such consistently solid puzzles, with logic that's familiar and yet still fresh. Thank you again for a wonderful Zipper puzzle.
