pzprxs (and other puzzling) updates!

Alright then. It's been too long.

pzprxs has been continuing to update and add new genres for quite a while at this point, and I have some old puzzle posts that didn't have solution check that I get to replace now! But this doesn't add the puzzles to the increasingly less relevant database, which I'd like to do. So, just like the big update 4 years ago I'll be reposting links for all of these puzzles.

Bosnian Road (previously appeared #356, #357 - Hexagony)

https://pzprxs.vercel.app/p?bosnianroad/6/6/h4b3l1b6h

https://pzprxs.vercel.app/p?bosnianroad/11/11/e3m4c7m2m6c2i4c3m4m5c6m1e

Isowatari (previous appeared #577 - #589 - New Genre Pack, #590)

https://pzprxs.vercel.app/p?isowatari/6/6/3/0i3fc0085610

https://pzprxs.vercel.app/p?isowatari/6/6/2/003692000000

https://pzprxs.vercel.app/p?isowatari/6/6/3/0420i00209l0

https://pzprxs.vercel.app/p?isowatari/7/7/4/090j0i3i0b0i6i090

https://pzprxs.vercel.app/p?isowatari/8/8/2/210330ii110360ii210330

https://pzprxs.vercel.app/p?isowatari/8/8/4/0006387460963000000000

https://pzprxs.vercel.app/p?isowatari/7/7/5/0i04l0179i6c1f000

https://pzprxs.vercel.app/p?isowatari/9/9/3/9b0ii1990009j0b1000119210j1

https://pzprxs.vercel.app/p?isowatari/9/9/2/090031a9030a043090909099103

https://pzprxs.vercel.app/p?isowatari/9/9/5/0000000o0k262060k060i0ii080

https://pzprxs.vercel.app/p?isowatari/12/12/4/0360200962i60910i1i223691369i2i20i203193200i0330

https://pzprxs.vercel.app/p?isowatari/11/11/5/0600i30010009b3390j32690k23ii006002090100

https://pzprxs.vercel.app/p?isowatari/15/15/4/ddddd90001940519iiija039ab06719i901940o1901219f30ab230jb21219l0f190001ddddd

https://pzprxs.vercel.app/p?isowatari/10/10/4/0001qg9i0360110099066021009phf0000

Nibunnogo (previously appeared #603, #604 - Puzzle Getchu!)

https://pzprxs.vercel.app/p?nibunnogo/6/6/gakde6dq7bddkb

https://pzprxs.vercel.app/p?nibunnogo/7/7/o3cgcc8chbbbbh7bcdg3cm

Japanese Sums (previously appeared #624, #625 - Puzzle Getchu!)

https://pzprxs.vercel.app/p?japanesesums/5/5/5/8h.9gah2.g.h76g54g..g31gbh

https://pzprxs.vercel.app/p?japanesesums/9/9/7/-1cj.9i1jc..hd2.hc..h2j.3i-1cjd3i-1cj31i56bh9.7h4.5h9.6hc76h556h

As for where I've been, I was hard at work on a few other puzzle related projects. Most notably a few months ago The Artisan of Glimmith released, a region division puzzle game with over 1000 handmade puzzles, curated by me, with Overwhelmingly Positive feedback and an estimated 100k+ sales! I spent so long staring at the organizational spreadsheet that I haven't wanted to look at my own personal puzzle spreadsheet or write supplementary documentation like these posts. I'm also the main contributor to Inkwell Games daily puzzles, with Star Battle, Light and Shadow, and Barred Simple Loop available. You can play the current week at any time, but past archive puzzles require a subscription to access. (and 236 Star Battle / 117 Light and Shadow are currently inaccessible). Keeping up with all of this is tough, so I'm hoping to find some time during upcoming vacations to actually work (haha) through my extensive backlog here. I've been saying that since Islands of Insight, though...

Puzzles #738 - #746 - Santa's Choco Banana

For the Secret Solver puzzle exchange on Puzzle'rs Club this past December, I got assigned Menderbug, who had previously written for me back in 2022. My first idea was to do something with Rail Pool, but before I started working on that idea I had a thought - what if I took the same idea that was made for me - a series of Symmetry Area puzzles on increasingly less regular grids - and applied that to Menderbug's signup comment of  "I like Choco Banana"? Once I had that idea, I had to go for it.

For all of these puzzles, all shaded areas must be convex and all unshaded areas must be concave. The entire pack can be found here.

My original plan was to make a small and large puzzle for each grid shape, and so I tried to focus on interesting logic for the smaller ones and that + a good layout for the large ones. Time pressure ended up pushing back some parts of this plan but the modular nature of the plan meant that I could easily scale back and have something that felt complete.

puzz.link interface

puzz.link interface

Menderbug is also the person who has pioneered triangular Choco Banana among the most, including making a few for GAPP. I definitely felt some pressure to try to deliver something new and interesting here, and while I'm not sure I succeeded I'm quite happy with what I ended up making.

penpa interface

penpa interface

Tetrakis Choco Banana has also been done before, though only with rectangle/not rectangle. I made so many mistaken deductions while trying to make these two puzzles... it's a weird geometry to get to grips with.

penpa interface

penpa interface

The last 3 puzzles are where the rules really start to fall apart a bit, as some of these geometries are really only good for a one-off puzzle. Rhombi worked okay but were prone to paired cell ambiguities, Snub Square actually worked very well and my biggest regret is only having time to make one of those, while Penrose... well, it's much like Rhombi except weirder. Definitely a one-off but a one-off worth exploring.

penpa interface

penpa interface

penpa interface

Overall I'm quite pleased with this set, and while Menderbug immediately thanked me specifically for it (not so secret) I knew that I was revealing my identity with the plan. He also said "I was going to say which puzzle/tiling I liked best, but I don't know, there was something really cool in each of them." after solving, which is very high praise indeed.

Puzzles #735 - #737 - We Are So Back (Double Back Variants)

Continuing my backlog posting of old puzzles I haven't shared, here are the three puzzles I made for Logic Showcase 66. The prompt was to make a puzzle with a Double Back rule, and I took that prompt in three different directions.

The first puzzle I made was a Norinori where the unshaded cells had to be solved as a Double Back. In other words, draw a loop passing through all but 2 cells in every region, that enters and exits every region exactly twice. Cells unused by the loop should be shaded, and each shaded cell should have exactly 1 shaded neighbor. I had a lot of trouble finessing some parts of this to be unique near the end, which was a bit annoying given how nicely the start worked out.

puzz.link interface     penpa interface

The second puzzle I made was an Aquapelago where each region has to have exactly two unshaded components. Originally I dabbled with a fully clueless grid for this but decided a few clues would be an important addition. The first version of this puzzle was also broken, unfortunately, but I was able to fix it.

puzz.link interface      penpa interface

Finally, I knew I wanted to make a proper loop puzzle - not just a Yajilin-style mashup. So I combined Double Back with All or Nothing - solve as an All or Nothing where every region is visited either 0 or 2 times.

puzz.link interface      penpa interface

Puzzles #702 - #734 - Mini Threes Pack

So I've still had a lot of things going on in real life that have generally prevented me from having any time to work on puzzles, including having almost my entire holiday vacation suddenly taken up. Even as I write this I'm recovering from being sick, but being too sick to work but well enough to actually do things is somehow the sweet spot of being able to assemble things I've already previously made, as long as it was just assembly.

A few months ago I made a single puzzle using only a couple threes, and that set me down the path of trying to make a varied, interesting set of 3-only puzzles. Yesterday I put them all in a PDF and, fittingly (but annoyingly) took 3 tries to get everything in I wanted (forgot links once - there are links now!) and had 3 non-unique puzzles (all fixed now - I originally intended to re-test everything, but I was rushed and still recovering and that's a lesson learned for the future). So yeah. Here's a big pack of puzzles and hopefully the final version, thanks to CJK for informing me of the problems with the first versions. I think in the future I'll just use a post like this as a hub for any packs I put out - that way I can at least fix in-place easily.

Mini Threes Pack (PDF)

Puzzle links follow, I will not be adding 33 images to this post nor will I be compositing them all into one image to include. You'll have to check the PDF.

Nurikabe      Canal View     Shugaku      Snake Egg
Cave      Akichiwake      Nurimisaki      New Tren
Kurotto      Mochinyoro      Choco Banana      Shakashaka
Slitherlink      Vertex Slitherlink      Hotaru Beam      Hashi

Geradeweg      Balance Loop      Four Winds      Round Trip

Regional Yajilin      Koburin      Maxi Loop      Turnaround (Full)

Fourcells      Nawabari      Aho      Compass

Fillomino (Borders)      Nanro      Sukoro      San-Anko

Gokigen

Puzzle #694 - Large Areas Only (Norinuri)

Nearly every Norinuri puzzle has to rely on either low numbers to fill space, or large ? numbers to fill space. At one point, I tried making one with only 10 clues, but couldn't quite finesse a solution grid. In the attempt I did find this one with only large, but not excessively large numbers, and it turned out there was a nice way to clue it, too.

puzz.link interface

Puzzle #692 - Speedwriting (Cave)

I wrote this Cave puzzle in 5 minutes after a brief discussion about trying to write a good puzzle in 2 minutes. I had most of a puzzle at that time, but elected to try to finish it off more nicely rather than just throw out a half baked puzzle. I got a bit lucky with a deduction in this just kinda working, and putting this post together - including getting links, getting images, tagging and scheduling - took longer than making the puzzle featured here.

Kind of insane.

puzz.link interface

I definitely don't regret having this blog set up as an archive of my puzzles, but man is it a lot of work sometimes.

Puzzle #689 - Chocolate Season (Choco Banana)

I recall making this Choco Banana after my friend Rever solved one with the same 1-2-3-4-5-6 pattern, and said that it could only resolve one way. I saw another way, so I made this puzzle to make it resolve another way. This is still such a good type I need to make more of and keep forgetting to make more of.

puzz.link interface

Puzzles #686 & #687 - Sixty Second Misfits (Pentominous, Statue Park)

Like I said yesterday, I made two unsubmitted puzzles for The Sixty Second Logic Showcase. I didn't submit the Pentominous because the theme ended up a bit imprecise and I didn't think it would do well in voting for that reason, despite being a fine puzzle. I didn't submit the Statue Park because even though my timing calibration was wrong, even I knew this one would be too long. I knew it when I started making it that it was almost definitely going to be too long, but I had an idea I wanted to try.

puzz.link interface

puzz.link interface

Puzzles #684 & #685 - A/B Testing (Fillomino, Cross the Streams)

My other two submissions for The Sixty Second Logic Showcase are a bit different. In both cases, the puzzles turned out much harder than I expected or wanted them to, so I had to add clues to nerf the puzzle. In both cases even the nerfed puzzle was something I knew was overshooting the difficulty side of things, though again my incorrect understanding of the timing component of scoring meant I wasn't too worried about the overshoot if the quality was way up there. And I felt for this Fillomino, it was. The Cross the Streams I thought had an outside chance of being quick enough for a secret reason but would almost definitely be the slowest puzzle in the set if not enough people caught on. Somehow I'd never made one of these before either!

I'll show and link the original version of the puzzles first - I'll include an image of the nerfed versions I submitted at the bottom of this post. I will not be linking the nerfed versions, however.

puzz.link interface

puzz.link interface

The Fillomino here took a half dozen aborted attempts and as many hours across a few days of trying, while the CTS took a much shorter time due to the nature of the puzzle. Honestly I think the Fillomino took me more time than every other puzzle I made for this showcase combined, even tomorrows' bonus pair!

And here are the nerfed versions - the Fillomino gets an extra pair of clues that smooth out the toughest part of the solve (but it still has a lot of steps) while the CTS gets more concrete values and less uncertainty in a few key clue rows. I don't think either of these changes moved the needle all that much.

Puzzles #681, #682 & #683 - More Showcase Backlog (Kurodoko, Tapa-Like Loop, Rail Pool)

Continuing the backlog, these were some of my entries for The Sixty Second Logic Showcase, where the prompt was to make a good puzzle that the median solver would take... sixty seconds on. I'm really happy with everything I made for this showcase, but in hindsight I should have attempted a more scattershot approach for estimating timing, as I misjudged where the median would be. All of my estimates were spot on relative to each other, but they were also about 50 to 60 percent longer than I had guessed, from assuming a larger overlap with logic race. Due to the combined scoring on votes and timing, and the timing component being a quadratic decay instead of a linear decay like I had misread, I placed very poorly in the final rankings despite doing pretty well in the unranked votes only ranks.

Anyway, onto the puzzles I submitted that I have one version of!

I started with a Kurodoko with what I hoped was an interesting logical theme. From my own timings I expected to hit about 1:10 with this which was close enough, but ended up at 1:50, and multiple people mentioning they got stuck after a couple opening steps. Unfortunate.

puzz.link interface

Since I thought that might be a bit long, I originally tried to aim smaller and stick to that logical theme idea with a 9x9 Tapa-Like Loop. 9x9 quickly didn't work for the theme I was going for, but loop puzzles can be speedy, so I was fine with going 11x11 if I thought the solve was straightforward. This one ended up being the closest to a minute timing-wise, but was still an overshoot.

puzz.link interface

My last puzzle and again an attempt to go easier was a 62 themed Rail Pool. This was the puzzle I was the most off-estimate for, since it's a less common type and thus the median solver has to take longer to find more common steps. I don't think it's a coincidence some of the closest puzzles were extremely common types, but again I don't regret trying something a bit more out there. Perhaps I should have gone even further in the obscure direction and made a 7x7 or something? Somehow, this is the first time I actually made a Rail Pool, too.

puzz.link interface

Puzzles #665, #666 & #667 - 24HPC Zodiac (NIKOJI, Nurimisaki, Balance Loop)

I also contributed several puzzles to the Puzzlers Club rounds at the 2024 24 Hour Puzzle Championship this year. We authored two rounds, each with 24 puzzles. The first round had one puzzle themed on each Greek letter, while the second round was a double zodiac (signs and animals).

Even though I've already done a Puzzle Zodiac before and wasn't too enthused by this theme, I still made 3 puzzles for the zodiac signs side of things. NIKOJI is otherwise known as Gemini Block, which was a type I was unaware of at the time of my original Puzzle Zodiac. The bottom row not being a word was kind of annoying, but I tried using Qat to find any words that could work and none existed. This was worth 30 points in the round.

puzz.link interface

Cats like to curl up in corners. Nurimisaki is a type all about corners. It's a bit of a stretch but I like the genre and had originally thought of the type for PZ, even though I went with Akari at the time. I checked with some solver assistance to see if there was any way of avoiding the extra circle in the top left corner and unfortunately found that it was impossible to specify that corner without another clue. Puzzle is worth 25 points.

puzz.link interface

To round out the comparison, I grabbed Libra to make a Balance Loop worth 50 points. This was one of the biggest missed opportunities of the original PZ in the name of genre balance, and while I don't regret my old choice of Minarism... this Balance Loop is way, way better. I did have a working version without that center clue at one point, but this required neutering a lot of the logic in the second half of the solve, so I sacrificed the purity of the theming for the sake of a much better puzzle. In general I skewed a bit larger on grid size this 24HPC to try to prevent undershooting round length again, and as a whole we succeeded -  the rounds were maybe a bit oversized, but well within acceptable ranges for the 24HPC as a whole.

puzz.link interface

Puzzles #660 & #661 - More 24HPC Shading (Light and Shadow, Aquarium)

I also contributed several puzzles to the Puzzlers Club rounds at the 2024 24 Hour Puzzle Championship this year. We authored two rounds, each with 24 puzzles. The first round had one puzzle themed on each Greek letter, while the second round was a double zodiac (signs and animals).

I made my now-standard Light and Shadow for Lambda, after some research into what lambda was usually used to represent. Turns out it's often used for light, which provided justification for the genre pick. This one ended up being worth 60 points, which I think is pretty fair for the size. I remember being quite happy that the underside of the lambda was all question marks, which always provide some fun reachability options.

puzz.link interface

I also made an Aquarium for Rho with only row clues. Because I thought it would be funny. I did put some consideration into what genre with row/column clues would be a good pick, but nothing else seemed quite as promising. This puzzle tested pretty breezily at only 20 points, which is about what I was aiming for.

puzz.link interface

Puzzles #658 & #659 - 24HPC Domino Kurodoko

I also contributed several puzzles to the Puzzlers Club rounds at the 2024 24 Hour Puzzle Championship this year. We authored two rounds, each with 24 puzzles. The first round had one puzzle themed on each Greek letter, while the second round was a double zodiac (signs and animals).

Very early on I grabbed Beta and made a variant Kurodoko where instead of shading single cells, you shade dominoes instead. This variant does result in a bit of struggle for uniquely specifying the orientation, and can also sometimes have long-term propagations that break the puzzle way in advance. I'm pretty happy with how this 40 point puzzle turned out. I also wrote an example for the type, since it wasn't a classic type.

puzz.link interface      penpa interface

puzz.link interface      penpa interface

Puzzles #652, #653 & #654 - IPC Round 3 (Killer Doppelblock, Clone Snake)

Like last year, I helped contribute to the Indian Puzzle Championship this year. If you're interested in seeing the rest of the set, including bonus puzzles, check the link for details on how.

Round 3 was themed on taking sudoku variants and applying them to non-sudoku puzzles. I put myself down for number placement, wanting to make a puzzle of a type that has arithmetic normally combined with killer cages. I thought about a few types before settling on Doppelblock. I also signed up for clone Snake since I knew the combination had potential from old, old Islands of Insight rule prototyping. In fact, now that that game isn't getting new content, I know a lot of these old unused puzzles will stay unused, so retain all the rights to them. I've gone through my archive and have about 80 puzzles in this category I think are good enough to share, so at some point I'll have to set up solving interfaces/write rules/share them.

Anyway, Killer Doppelblock! Standard Doppelblock rules apply. Additionally, all the numbers inside a cage add up to the number in the corner of the cage. This is a pretty cool combination, where the different ways of getting partial sums interact in some really cool ways. This was worth 65 points.

penpa interface

Clone Snake: Standard Snake rules apply, with given endpoints and an unknown length. Two cages of the same shape and orientation must have the same arrangement of snake and not snake cells. The first puzzle here is actually one of those old IOI prototype puzzles, since I added it to the organization sheet after a couple failed constructions, to at least have a puzzle in the slot. I put a note that this was from a couple years ago and I didn't think anyone at the IPC would have seen it before. A few hours later, I finally turned up a satisfactory second puzzle, and added that to the sheet to provide an option for which puzzle to use. Prasanna chose both, worth 30 and 50 points.

penpa interface

penpa interface

Puzzles #649, #650 & #651 - IPC Round 1 (Fivecells, Cave, Yajilin)

Like last year, I helped contribute to the Indian Puzzle Championship this year. If you're interested in seeing the rest of the set, including bonus puzzles, check the link for details on how.

As usual, round 1 revisits puzzle types that appeared in Puzzle Ramayan throughout the year. I contributed 3 puzzles to this round, a 55 point Fivecells, a 30 point Cave, and a 25 point Yajilin.

I had a really tough time settling on a theme for my region division pick, but once I thought of putting pentominoes of clues into the grid, I had to run with it. It was a small step from there to try pentominoes of only 3s, and some initial steps proved quite workable and interesting, so I kept pushing at that idea until I had a finished puzzle. I'm a bit sad about the diagonal touching, but there was no way around it and the theme is still quite clear.

puzz.link interface

Cave was an option. I like Cave. I'm good at making Caves. So for some reason I tried to find a valid, interesting puzzle with this layout, and suffered for hours with multiple very close attempts that were a single ambiguous cell away. I also didn't start from this full layout, just one half with a cool opening, and eventually tried for the full symmetry after finding no good continuation.

puzz.link interface

Originally I had just claimed two spots in round 1, but the evergreens category remained empty as the deadline approached. So I made a Yajilin for the slot, didn't like it, made another Yajilin for the spot, thought it was a bit rough in the middle, and made yet another for the spot, which is this puzzle. This is a pretty slick layout I think, the bigger tilted square works really well for Yajilin.

puzz.link interface

Puzzle #648 - Choco Banana

Lately, when I can't fall asleep, I tend to either do some reading, or make a puzzle. Last night was the latter, so I took a stab at making a Choco Banana with a theme I'd thought of a couple days prior but hadn't gotten around to trying to make yet. I like how this one came out quite a bit, and decided to crosspost it to puzsq since I think it's a puzzle the regulars there will really appreciate.

puzz.link interface      puzsq link

I've got another 20 or so unpublished puzzles I haven't gotten around to posting yet - had a lot going on and haven't really found the time to queue things up. Hopefully I get to it soon? This space isn't dead, you hear!

Puzzle #647 - Four One (Tapa)

This is the best puzzle I've ever made. GMPuzzles wishes they could have Tapa puzzles as incredible as this one. Toketa would be jealous of the sheer beauty of this construction.

...what do you mean, it's bashy?

puzz.link interface

I'd wish you good luck, but solving this puzzle will never happen. It's literally impossible. A lie, a myth, a farce propagated by the government to mislead the ignorant. Anyone who thinks it's possible is stupid and should feel ashamed, and can wallow in their own lack of intelligence. This is an irreversible fact of logic puzzling and simply cannot be challenged. Go cry about it, nerds.

I'm not late for publishing this, it's still April 1st in my time zone!

Puzzle #646 - Numbers are Overrated (Nurimisaki)

Someone in Puzzlers Club mentioned a Nurimisaki pattern that would force a deduction, which put me in the mood to make one. So I did, finding my own neat pattern that somehow managed to finish without needing any clue numbers. This is such a fun genre.

puzz.link interface

Puzzle #640 - Fourced (Light and Shadow)

Light and Shadow is still such a good puzzle type. I spent a while toying with this layout of 4s and trying to find any good solution for several white layouts, with all white clues being question marks, before finally finding one. The first version was super bashy and I wasn't going to share the puzzle widely, but something compelled me to keep tweaking it and before long I actually did find a fair, albeit hard variant.

puzz.link interface

Also, these rules could potentially appear in Islands of Insight, which should launch about a week ago (I'm writing this on January 25th and may not update this space before it goes live). I've worked really hard on that game, especially the puzzle content for the past 3 years and I'm really, really excited for it to be out there for anyone to see.

Sometime around my birthday, I might post a collection of my favorite puzzles from the game. Regardless of your puzzle experience level, you won't be disappointed!

Puzzle #638 - Too Many Questions (Chained Block)

Some people on Puzzlers Club were making Chained Block puzzles. I realized I hadn't made one before. So I made one.

puzz.link interface

Yeah, I don't know either.