Puzzle 36: Akari 4

Hope you enjoy.

Puzzle 35: Tatami 1

Sorry that I have been away for so long, avid readers. I have been preparing for the summer of programming contests (Google Code Jam, TopCoder Open and the Internet Puzzle Solving Contest).

Hopefully I should be back to my usual one-puzzle-per-weekday schedule. Let me know if there are any types of puzzle you would particularly like to see.

Rules of Tatami

Split the grid into subrectangles, so that each subrectangle contains exactly one marked cell. 

It is not allowed for four subrectangles to meet at a point.

This marked cell indicates how the dimensions of the subrectangle compare. If the subrectangle is longer than it is tall, the marked cell should be marked with a horizontal line, whereas if it is taller than it is long, it should be marked with a vertical line. Finally, if the subrectangle is square, the marked cell should be marked with a plus.

Puzzle 32: Lits 3 (Redo)

Well it turns out my first version of Puzzle 32 had more than 1000 different solutions (thanks Prasanna for noticing). I have fixed it, and have verified that this one has only one solution, but I have made the puzzle substantially harder (or harder than I thought it was...). By the way, sorry that I have not been publishing much recently - I have been preparing for the Google Code Jam Qualification Round.

Puzzle 34: Bag 1

As requested, a corral puzzle.

Puzzle 33: Nurikabe 6

Thought I'd make a bit of an easier puzzle today. (Let me know if that didn't work out)

Puzzle 32: LITS 3

Hope you enjoy.

Puzzle 31: Masyu 6

Another anti-symmetric Masyu.

Puzzle 30: Shakashaka 1

The puzzle type that most reminds me of Portinatx.

Puzzle 29: Masyu 5

My first Masyu with perfect anti-symmetry (every white circle is 180 degree symmetric from a black circle and vice versa).

Puzzle 28: Mochikoro 2

Here is a Mochikoro. Note that there is one clue on each row, and one clue on each column, and the clues are the numbers 1 to 10, each occurring once. Note also, that there is 180 degree symmetry, and that the symmetrical pairs are 1-6, 2-7, 3-8, 4-9 and 5-10. Thought that was interesting. That's all.

Puzzle 27: Heyawake 4

Fiddlier end of medium, I'd say.

Puzzle 26: Heyawake 3

This one is quite hard, in my humble opinion. The key is to consider the four central squares.

Puzzle 25: Masyu 4

Puzzle 24: Heyawake 2

I think I am done with this grid (cf. Country Road 1 and Shimaguni 1) for now.

Puzzle 23: Masyu 3

Hope you enjoy! Do you guys think it is beneficial to have difficulty ratings on these puzzles or not?

Puzzle 22: Tentai Show 1

Thanks to my long time collaborator Dave T for the picture.

Puzzle 21: Country Road 1

Decided to use the same grid I used for Shimaguni 1. May well use it for Heyawake 2 as well.

Rules for Country Road

Shade some squares and draw a continuous path through the rest of the squares so that:

• The path goes through each region exactly once.
• Any numbered cell contains exactly that number of squares on the path.
• No two shaded cells lie directly across a region border from each other.

Puzzle 20: Mochikoro 1

My first attempt at constructing this style of puzzle. Let me know if there are any other styles of puzzle you would like to see.