Pentominous U-Bahn
(Published on 17. November 2024, 02:15 by KNT)
Draw a totally connected loop network through the centers of some cells, which may branch or turn, but may not have any dead ends. A clue outside the grid indicates how many times the corresponding line shape (i.e. a cross, branch, straight line, or turn) appears in the corresponding row or column, irrespective of the line shape's rotation. The loop network may enter the black cells freely.
Every pentomino must satisfy one of the two following conditions:
1. All non-empty cells within the pentomino must be the same line shape. Two pentominos satisfying this condition may never be orthogonally adjacent.
2. The pentomino must contain one turn, one straight, one branch, one cross, and one empty cell.
SudokuPad
Solution code: For each row except the last, the number of lines leading down from that row. X if greater or equal to ten.
Comments
on 29. January 2025, 21:51 by glum_hippo
I don't think I'll ever solve this, but you could even now still make the black cells light grey. Worth the effort?
on 11. January 2025, 06:48 by Agent
Awesome puzzle, very challenging, congrats on #100!
on 14. December 2024, 05:10 by MaizeGator
Crazy difficult, but as others have said, nothing unfair. Beautiful combination of the two rulesets in the tutorials.
on 9. December 2024, 22:09 by Nensche777
Really great, thanks a lot!
on 9. December 2024, 14:58 by Alex
Brilliant puzzle. Was extremely hard for me, but one of those you just can't put down.
on 30. November 2024, 20:06 by KNT
@peacherwu2: Congratulations on the solve! It is certainly a challenging puzzle, but I have seen that you regularly solve very hard things too, so it surprises me this is the hardest you have completed in years. Maybe the solution video in the hidden comments can elucidate some sections you struggled on?
on 30. November 2024, 20:02 by KNT
@ibag: I didn’t even consider that, I’m too used to using red lines for everything on online solving software. Graphic design has never been my strong suit :-)
on 30. November 2024, 19:57 by peacherwu2
Gee! Haven't done anything harder than this for years! Yet very intriguiging throughout! I can't imagine how any *human* can come up with something like this.
on 30. November 2024, 19:55 by ibag
Fantastic puzzle! One request: Next time, please make the black cells much lighter. Solving with paper and pencil was a bit confusing - even more so than it already is ... ;-)
on 30. November 2024, 00:20 by Zombie Hunter
I can't tell you how many times I got to the last cell and broke it. Glad I didn't quit. Very enjoyable.
on 20. November 2024, 22:24 by the_cogito
Really nice puzzle, congrats on your 100th!
on 18. November 2024, 23:46 by ONeill
A worthy 100th puzzle, thanks for all them!
on 18. November 2024, 20:47 by Samish
Immensely fun to solve, always intuitive which makes it relatively smooth! Thanks for those puzzles and congrats for the milestone =)
on 18. November 2024, 12:13 by Christounet
Great tutorial again !
Thanks 000KNT :)
on 18. November 2024, 07:03 by wooferzfg
Consistently challenging but without any unfair steps - as good as I expected from you. Thanks and congrats on 100 published puzzles :)
on 18. November 2024, 01:01 by polar
Sorry (not really) to be an eternal troll, but it's actually not the 100th puzzle you've published on LMD.. ;)
In any case I look forward to finding the time for all 3, despite pentominoes.
on 17. November 2024, 20:02 by KNT
@ibag Obsessively checking the IDs on the sudokus tab for a couple days and about 6 blank puzzle pages...
on 17. November 2024, 17:59 by Jesper
Great puzzle, well worthy of being the 100th! Also the warm-ups are very enjoyable :)
on 17. November 2024, 12:02 by Myxo
I'm sure this will be easy.
on 17. November 2024, 09:19 by ibag
Haha, how did you manage to get this puzzle ID?
on 17. November 2024, 07:21 by RJBlarmo
Congrats on 100 posts! I remember the first U-Bahn I did was one of yours and now it is one of my favorite genres! Fantastic puzzle too, definitely worthy of being your 100th!
on 17. November 2024, 06:25 by Playmaker6174
Gotta say, already the timing makes this puzz 100x more worthy to solve, but I may take a while……
on 17. November 2024, 05:53 by KNT
I've left a solving video in the hidden comments for anyone that solves it and wants to compare to my (rough) path.
But anyway... I hope you enjoy the puzzle! It feels pretty surreal to have 100 posts on Logic Masters now. Seriously, thank you to everyone that solves what I set, it has motivated me a lot over the past few years. :-)
To the next 100!
