Puzzle No. 468 : Skyscraper Sudoku [Daily League]

First, a note about PDFs of previous weeks. Christoph Seeliger of Germany has kindly taken up PDF responsibilities with slight changes to how Tom used to do it. I’ll start linking to the PDFs from week 47 onwards, but 37-46 are all on our Facebook group.

Remember that you can solve the puzzles from the League online on the Sudokucup Guest League page with a 24h delay.

I realize I posted a Skyscraper variant just 2 weeks ago, but this is mainly a “reject” from a set I provided. It is rejected for being too hard, or to be more accurate, requiring too much non-Sudoku logic. I agree with this assessment, and still think its a nice Sudoku to solve. So here. (Yeah, I’ve gotten into the habit of saying “so here” now)

Rules for SudokuAdditionally, each number in the grid represents the height of the skyscraper in each cell. The digits outside the grid indicate the number of skyscrapers seen from the corresponding direction.

Rated – Hard.

Enjoy!

P468

P468

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Puzzle No. 462, 463 : Double Skyscrapers, Crazy Pavement

In Bangalore right now to conduct the Bengaluru Brain Games’ Sudoku and Puzzle events in about 2 hours time. Quickly making this post before leaving.

These are more of the WPC practice. Crazy Pavement is easy without much going on. Double Skyscrapers has the non-symmetric circle because I forgot the converse rule when I created it for practice. It is solvable without that and without the converse rule, unfortunately.

Rules (as in WPC IB) –

For 462 (Serbian Snacks, Round 7) – Enter a digit from 1 to 6 (1 to 5 in the example) into each cell so that each row and column contains each number exactly once. Each digit in the grid represents the height of a building and the clues on the outside of the grid indicate how many buildings can be “seen” when looking from that direction. Taller buildings block smaller ones from being seen. In addition, digits in cells in the outer grid with a circle provide similar Skyscrapers clues for the inner grid for a horizontal or vertical (but not diagonal) direction. All such cells are marked with a circle.

For 463 (Dutch Delight, Round 4) – Paint some cells in the grid so that for each region either all its cells are painted or none at all. Numbers outside the grid indicate the number of painted cells in that row/column.

Enjoy!

P462

P462

P463

P463

Puzzle No. 459 : Odd/Even-View Skyscrapers [Daily League]

Back after a forced week long absence due to schedules. I’ll write a bit more tomorrow with some puzzles.

Remember that you can solve the puzzles from the League online on the Sudokucup Guest League page with a 24h delay.

Rules for Sudoku. Additionally, each number in the grid represents the height of the skyscraper in each cell. The digits above and to the left of the grid indicate the number of odd skyscrapers seen from the corresponding direction (considering even digits as transparent). The digits below and to the right of the grid indicate the number of even skyscrapers seen from the corresponding direction (considering odd digits as transparent).

Rated – Medium.

Enjoy!

P459

P459

Puzzle No. 451 : Inside Skyscrapers Sudoku [Daily League]

This post has been scheduled to appear on Tuesday evening. If it appears before/after that, blame WordPress 😛 Anyway, this is a Sudoku I had written for Team India’s practice, and since as of today the relevant round will have been done in the morning, it can be shared to the general public. The Sudoku is quite challenging. I like how it turned out.

Remember that you can solve the puzzles from the League online on the Sudokucup Guest League page with a 24h delay.

Rules for Sudoku. Consider each number to be the height of a building. Digits within cells with arrows indicate how many buildings can be seen when looking in that direction from the focal cells (taller buildings conceal buildings smaller or of equal height behind them).

Rated – Hard.

Enjoy!

P351

P351

Puzzle No. 382-396 : Czech Puzzle Championship Puzzles

I think this was a set I wrote when I wasn’t that well. That’s not meant as an excuse, but as a warning – I tend to make things harder when I’m ill. However, some of these are also rejects from newspaper bunches for being not-too-easy (Heyawake for example) which means there’s some easy in there too. Unlike my previous puzzle set posts, I decided to find out a bit more this time, which basically means that I can add the points that were assigned to each puzzle. The Skyscrapers Pentomino was not used, but since it was not used for being too hard, I’ve simply valued it at points higher than any of the others.

The Championship had 5 rounds and then a playoff at the end. The first round had the largest time slot and so two of the hardest puzzles of my set, the Yajisan Kazusan and the Shakashaka were moved into that round. Two others, Heyawake and Multiplicative Corral were moved to the Playoff/Final. There’s no point valuing for these, but I’d put their difficulty around the LITS or the Country Road, something of a medium difficulty.

There were 25 participants, and Jan Novotný emerged as the winner, mainly by having a good playoff, as Matej Uher was ahead after the first 5 rounds (377.8 – 299.2). In fact, Jan was 4th before the playoffs, behind Jana Vodičková (332.5) and Jakub Hrazdira (306). Congrats to him, and the other qualifiers. For my round (the 4th round, valued at 110 points), the top scorers were Matej Uher (85), Jakub Ondroušek (77) and Jakub Hrazdira (62). I’m posting only my own puzzles but as a test solver for the event in general, I did have access to the other puzzles too, and the quality is quite high throughout. If you’re interested in knowing more, or you are a Czech/Slovakian interested in becoming a member of the HALAS Association (where I think you will gain access to all these puzzles), I’d suggest you contact Jiří Hrdina, who co-ordinated/organized this Championship.

Rules/links and points –

P382 : Bosnian Road (8 points).

P383 : Country Road (12 points).

P384 : Easy As Tapa (14 points) – Follow regular Tapa rules. Clues outside must be placed in the first unshaded cell in that row or column.

P385 : Fillomino (7 points).

P386 : Heyawake (Playoff puzzle).

P387 : LITS (12 points).

P388 : Masyu [Alternative] (4 points) – Follow regular Masyu rules. Additionally, the loop cannot pass two circles of the same colour continuously.

P389 : Multiplicative Corral (Playoff Puzzle) – Draw a single closed loop along the grid lines that contains all the numbered squares and does not touch itself, not even at a point. Each given number is the product of two numbers: the number of interior squares that are directly in line vertically with that number’s square (including the square itself) times the number of interior squares that are directly in line horizontally with that number’s square (again, including that square itself).

P390 : Nanro (14 points).

P391 : Norinori (5 points).

P392 : Product Heyawacky (25 points). Follow regular Heyawacky rules. Additionally, the number at the top left of a cage is the product of shaded cells in each different region, only pertaining to its area within the cage.

P393 : Shakashaka (40 points).

P394 : Skyscraper Pentomino (60 points?). (Edit – It should be noted that the puzzle in the link has “X” marks where pentominos can’t be placed, whereas the puzzle below has black cells denoting that)

P395 : Sum Skyscraper (9 points). Follow regular Skyscrapers rules. This skyscraper uses the digits 1~7. The numbers outside indicate the sum of the visible digits.

P396 : Yajisan Kazusan (40 points).

Now, the puzzles! Enjoy!

P382

P382

P383

P383

P384

P384

P385

P385

P386

P386

P387

P387

P388

P388

P389

P389

P390

P390

P391

P391

P392

P392

P393

P393

P394

P394

P395

P395

P396

P396

Puzzle No. 351 – 366 : Zagreb Open puzzles

I managed to somehow squeeze this set out in one day just before my exams started, right in the middle of the hectic submissions time in college. After that, Vladimir managed to squeeze in some time on that day itself to test these puzzles, so many thanks to him for that.

Rules all placed at the start of the post with the puzzles coming later (Trying a new format for posting, simply because its more convenient for me. The puzzle captions should aid you in knowing which rule is for what puzzle, but the ordering is the same as well, so it shouldn’t be much hassle either way.

Rules –

351 – Akari.

352 – Fillomino.

353 – Graffiti Snake.

354 – Heyawake.

355 – Japanese Sums – Place the digits 1-6 in some of the squares, so that no digit is repeated in any row or column. Sums on the outside indicate the sums of consecutive digits in that row or column, in order. Each sum is seperated by at least one empty square.

356 – LITS.

357 – Nanro – Write numbers in some cells of the diagram. All numbers in a region must be equal. The given number in a region denotes how many cells in this region contain a number (at least one). Same numbers must not be orthogonally adjacent across region boundaries. Numbered cells must not cover an area of size 2×2 or larger. All numbered cells must form a single orthogonally continuous area..

358 – Odd Even Skyscraper – In addition to Skyscraper rules linked to below, all outside clues that are shaded are odd. The rest are even. Range 1-6.

359 – Pentopia.

360 – Regional Yajilin.

361 – Shakashaka.

362 – Skyscrapers. Range 1-6.

363 – Tapa.

364 – Tents – Place a tent ortogonally next to each tree so that no two tents touch eachother, not even diagonally. Numbers on the outside indicate the amount of tents that are in that row or column.

365 – Walls Fillomino – Some region borders are given; i.e. the numbers on both sides must be different.

366 – Yajisan Kazusan.

Enjoy!

Akari

P351

Fillomino

P352

GraffitiSnake

P353

Heyawake

P354

Japanese Sums

P355

LITS1

P356

Nanro

P357

OddEvenSkyscrapers

P358

Pentopia

P359

RegionalYajilin

P360

Shakashaka1

P361

Skyscrapers

P362

Tapa

P363

Tents

P364

WallsFillo

P365

YK

P366