Code Road is now open

I am happy to announce the opening of the 1st Code Road!

From now until 23rd November, you can solve puzzles and be in to win the 2013 Mindbenders and Brainteasers Calendar. The puzzles are all linked on top of this site.

Puzzle 1 is the only one available and its answer is used to open Puzzle 2.

Puzzle 3 can be opened using the answer from Puzzle 2 and so on.

Please e-mail me the passwords as you go along (to roygbivpuzzles –at- gmail –dot- com) because the more puzzles you solve, the more entries you will get in the prize draw.

Be sure to check out the details for more information and the  hints page when you’re stuck.

Remember to capitalize your answers!

Light Read #1 – Inverting the Nurikabe

Nurikabe (or sometimes known as “Islands”) is one of the classic puzzle type made famous by Nikoli. The numbers inside the grid represent an island that many cells wide. Islands, series of white squares, can only touch other islands diagonally. The remaining cells, representing the ocean, are shaded. The ocean has to interconnect throughout the grid and no 2×2 squares can be shaded.

In most Nurikabes, there is more ocean than there are islands; hence, more shading than leaving cells blank. When solving on paper, this gets really annoying for several reasons. Firstly, there are problems with cleanliness, shading in like crazy will imprint unwanted marks and smudges in the next page and the opposite page when you close the book.

Secondly and debatable, you tend to visualize things better if the islands were shaded and oceans left blank. Similar to what you originally do to islands, you can dot the oceans.  When you encounter 3 of 4 shaded cells of a 2×2 square, you tend to dot the remaining cell to represent an island and must somehow weave to that cell, but vice versa, shading in the leftover cell from the 3 of 4 dotted cells is more convenient.

I do this all the time when I’m solving on paper, after a while you get so proficient that dotting isn’t even necessary.

From Nikoli Puzzle Box 9

Does anyone else solve it this way?

Would this notation get me penalized in tournaments?

Here is a Nurikabe from my puzzle shed.

Nurikabe – Shade in black cells, representing the ocean, to isolate several islands (interconnected series of white cells). Islands cannot be adjacent to any other islands. The numbered cell (part of different islands) shows the size of that island. There can be no 2×2 shaded cells of ocean.

(Somewhere Over the Rainbow, Oct 2012)

Flashback #9 – Alphabet Diagonal Sudoku

The finals of that day were quite exciting. The top 5 raced through three puzzles in order; the first was a Thermometers Sudoku then it was a Kenken. This was the 3rd of three puzzles solved during the finals. I had to tweak this several times to get things working. Note that the high school hosting the competition is called Debsirin.

Alphabet Diagonal Sudoku: – Fill in different letters so that no letter repeats in any row, column, bolded 3×3 regions and the two main diagonals.

Nonthaburi, August 2011