Sorted Coral Subway
(Published on 3. August 2024, 08:23 by wooferzfg)
This puzzle was created by Jakhob and wooferzfg, and it is a combination of a U-Bahn and a Coral. It takes inspiration from Sorted Subway by KNT and Ideenklau im Sparmodus from Wichtel 2021.
If you are unfamiliar with U-Bahn, here is a guide that covers the core logic.
Shade some cells so that all shaded cells form one orthogonally connected area and the unshaded cells are all connected orthogonally by other unshaded cells to the edge of the grid. No 2x2 region may be entirely shaded.
Draw a totally connected loop network through the centers of some unshaded cells, which may branch or turn, but may not have any dead ends.
If a row or column has clues, then all non-zero U-Bahn clues and all Coral clues are given, sorted in ascending order.
U-Bahn clues indicate how many turns, straight lines, branches, or crosses occur in the row or column, irrespective of the line shape's rotation.
Coral clues indicate the lengths of the blocks of consecutive shaded cells in the row or column.
A “?” may represent any positive integer value.
Solution code: For each row except the last, from top to bottom, the number of lines leading down from that row
Comments
on 14. October 2024, 23:42 by Christounet
Omg, what a journey !!
Incredibly hard and good. Your U-Bahn hybrids are always great, but this was greater. Thanks :)
on 23. September 2024, 22:37 by Agent
Amazing puzzle, really well constructed!
on 12. August 2024, 21:52 by Jesper
Epic puzzle!
on 4. August 2024, 23:40 by Myxo
Absolutely crazy puzzle. Awesome!
on 4. August 2024, 07:08 by KNT
One of the very hardest and most fascinating puzzles on the portal. Took me a very long time, but every step is clearly designed with maximum care and extreme attention to detail. Galactically good
on 4. August 2024, 05:17 by ONeill
Brutal puzzle, it was very satisfying figuring out each step, even if it did take me a long time. Thanks!
on 1. August 2024, 16:17 by wooferzfg
This puzzle is difficult - if you'd like a hint or a check of your current progress, feel free to either leave a hidden comment or message me on Discord (@wooferzfg).
(If you're solving on SudokuPad, you can ignore the box in the corner outside the grid. That's just a way to make it possible to put marks on the clue cells.)
