Puzzle #23

   This is a Kurodoko puzzle.

Difficulty: hard

Theme: logical

Puzz.link link. 

Found this one deduction in a different puzzle, made a puzzle to properly exploit it. If you know what you're looking for, though, this is a breeze.

Puzzle #22

  This is a Masyu puzzle.

Difficulty: extreme

Theme: None

Puzz.link link. 

This was originally made to showcase one particular deduction, but I accidentally made it too hard and bashy while trying to remove cooks. Oops. Well, hopefully it's still not too bad...

Puzzle #21

 This is a Yajilin puzzle.

Difficulty: medium

Theme: No Blacks?

Puzz.link link. 

Inspired by two Yajilin puzzles on a similar theme by Twitter user @agnomy. There are two main ways people have found to get to the solution, and neither are that easy.

Puzzle #20

This is an Numbered Arrows Mashup Loop puzzle, an original mashup genre. Rules are given below the image.

Difficulty: hard

Theme: Secret Santa Gift for IHNN


Puzz.link (Note that the answer checking and clue colouring are nonexistent here, since this merely uses the Yajilin interface.)

Rules: Draw a loop through non-clue cells and shade the unused cells. Shaded cells may not be orthogonally adjacent (as in Yajilin). Each arrowed clue has a “line of sight” in the given direction, up until the edge of the grid. In addition, each quadrant's clues behave differently:
  • Clues in the top-left quadrant are Yajilin clues; they indicate the number of shaded cells in the clue's line of sight.
  • Clues in the top-right are Castle Wall clues; they indicate the total length of the loop segments along that clue's line of sight.
  • Clues in the bottom-left quadrant are Slalom Count clues; they indicate the number of times the loop passes straight across the line of sight of the clue without turning. (Note that this type of clue does NOT count occurrences of the loop passing through the line of sight when turning, and that the loop is allowed to behave in this way regardless.)
  • Clues in the bottom-right quadrant are First Seen Geradeweg clues; they indicate the length of the first-seen loop segment; if the first-seen cell used by the loop is a corner, both segments incident to that corner must be of that length.
(The small images around the puzzle are to remind you what each clue does.)

Below is an example and its solution:

I actually constructed this one for Puzzlers Club's annual Secret Solver event last year and only just got around to posting it now. Secret Solver is our version of Secret Santa, wherein everyone participating writes a puzzle for someone else. In this case, I had to write a puzzle for IHNN.

A full walkthrough and writeup can be seen here (but please don't read it until you've at least had a good crack at the puzzle). Many thanks to SoftFro for creating the images and PDF.

Even though, having constructed it, I think it's a medium, I'm rating it as "hard" just in case, and in part due to the fact that two of these genres are novel.

Anyway, I should probably get around to porting most of my puzzles to this blog (except maybe the ones I'm submitting elsewhere?). I've been constructing puzzles occasionally for the last 6 or so years, so I *should* have a pretty reasonable backlog. (Then again, a ton of them are "easy" by my standards and I don't necessarily want to flood the blog with them...)

Puzzle #19

This is a Look-Air puzzle.

Difficulty: easy

Theme: Algorithmically Generated

Puzz.link link. 

Puzzlers Club has recently been experimenting with generating puzzles via the simple algorithm of "place a clue in the first spot where it can go, then repeat". Here's a Look-Air generated by placing a "2" in the first cell in reading order that could contain one legally (and which would give information).

Puzzle #18

This is a Heyawake puzzle. 

Difficulty: extreme

Theme: Filled Empty Space

Puzz.link link. 

Recently learned about an advanced Heyawake deduction. Here's my take on it. In addition, this puzzle requires bashing (or some deduction I haven't figured out yet). That's why this puzzle merits an "extreme" rating and not merely a "hard" rating. You have been warned.

Many thanks to rob and Freddie Hand for proving this unique.

Puzzle #17

This is a Castle Wall puzzle. 

Difficulty: medium

Theme: Logical

Puzz.link link. 

Just a puzzle I decided to make, using a Castle Wall deduction I don't seem to see too often. In general, I find that most Castle Walls available tend to use only deductions I consider "easy", so hopefully this will introduce you to a deduction you might not have known. Then again, given who likely reads this blog, I'm guessing that most of you already do know this deduction...

Rules link is to MellowMelon's blog; he created this puzzle genre. I'm sure there's MUCH more potential in this genre than the deductions I already know of and have seen elsewhere, though.

Puzzle #16

This is a Cipher Hashiwokakero puzzle, a variant of Hashiwokakero. In addition to the rules of Hashiwokakero, each number has been replaced by a letter. Different letters refer to different numbers, and the same letters refer to the same number.

Difficulty: medium (not actually an Evil Zinger)

Theme: Bridge X-tension

Puzz.link link. (Note: Because Puz-PRE does not use letters in Hashiwokakero, all Xs in the puzzle have been replaced by blank islands in the link. Puz-PRE does not have the "same letters refer to the same clues" constraint programmed in, so the solver may mark incorrect answers as correct.)

Puzz.link does not support letters in Hashiwokakero, I had to manually add all the Xs in Paint.NET.

So yeah, this puzzle isn't quite as EZ as a normal Evil Zinger as I would have liked. Shame.

Puzzle #15

This is a Masyu puzzle.

Difficulty: medium

Theme: Logical

Have a Masyu puzzle I constructed on request from an acquaintance. No clue how often I'll keep updating this blog, but I think I have something for here that I should probably post at some point.

Puzzle #14

This is a Double Choco puzzle. I can't be bothered to write rules pages for every single genre that I come across any more, so the rules are below.

Difficulty: hard

Theme: Valentine's Day

Puzz.link link.

Divide the grid along the grid lines into orthogonally-connected regions. Each region should have exactly one grey half and exactly one white half; each half-region should be orthogonally connected, and the two halves should be exactly congruent. Numbers indicate the size of the half-region containing them; a region can have zero, one, two, or more numbers inside it.

Apparently Japanese Puzzle Twitter is making a bunch of these for Valentine's Day, so I thought I'd join in the fun. However, the latter half of the puzzle was difficult to finish off and I ended up enlisting the help of Puzzlers Club. Thanks to ManyPinkHats for coming up with a good end. It's still quite casebashy, though, so you have been warned.