Yeah, I'll admit it. I believe in monsters. I mean didn't before, but then I designed this monster of a Masyu, not for the faint of heart. Don't be lured in by her tempting easily start, because it just don't last!

## Friday, 29 January 2010

### A lightbulb idea?

Well, here's one that got me the other day...

This puzzle take place in two rooms. In the first room are three lightbulbs all connected to three switches in the other room. In this house a man is trying to figure out which switch activates which which bulb. Starting in the room with the switches I can tell you with certainty that this man can move from the switch room to the lightbulb room, not walk back in the switch room and still tell which switch activates which lightbulb, even with the constraint that the man has to move out of the doorway and into the lightbulb room to see the lightbulbs.

Your task is to tell me how.

Yeah it got me as well!

This puzzle take place in two rooms. In the first room are three lightbulbs all connected to three switches in the other room. In this house a man is trying to figure out which switch activates which which bulb. Starting in the room with the switches I can tell you with certainty that this man can move from the switch room to the lightbulb room, not walk back in the switch room and still tell which switch activates which lightbulb, even with the constraint that the man has to move out of the doorway and into the lightbulb room to see the lightbulbs.

Your task is to tell me how.

Yeah it got me as well!

### Diagonal Sudoku, a beauty

### Easy as ABCDEFGHI... wait a sec ABCD yeah that's right

### Rules for Easy as ABC

Rules for Masyu are as follows,

Place exactly one of each letter from "A" through to the letter designated by the puzzle inclusive in each row and column. The rest of the row or column is left blank.

The letters outside the grid give the first non-blank entry found in that row or column and from that "viewpoint"

A-C

### Dizzy Sudoku

## Wednesday, 27 January 2010

## Monday, 25 January 2010

### Diagonal Sudoku

## Friday, 22 January 2010

### The first Masyu

### Rules For Masyu

Rules for Masyu are as follows,

Draw one complete loop around the grid such that...

The loop does not overlap or cross itself

The line passes through all black and white circles

Where the line passes through a white circle it goes straight on

The line must make a right angled turn on at leat one side of a white circle

Where the line enters a black circle it must make a right angled turn

### Rules for Fillomino

### Give me an L, Give me an I, Give me a T, Give me an S, what have got LITS!

I reckon it's about time I got another puzzle on here and what better way than to introduce a new type of puzzle, LITS! This is where you have enter one of four tetrominoes (posh name for a shape that takes up four squares) in each area.

For those who have never tried this type before I urge you to read the rules first but once you're ready...

What are you waiting for!

### Rules for LITS

## Thursday, 21 January 2010

### Nine Weights Problem and Twelve Weights Problem

These are old puzzles, certainly not my own (for once), but they are great thinking problems with really elegant solutions, see if you can solve them.

I have before me nine weights. Of which just one is slightly lighter. Using only scales I must find out which of these weights is this lighter one. How do I do this?

This problem is possible in just two weighs.

Slightly harder is the twelve weights problem...

I have before me twelve weights. Of which just one is slightly lighter. Using only scales I must find out which of these weights is this lighter one. How do I do this?

This problem is possible in just three weighs.

I have before me nine weights. Of which just one is slightly lighter. Using only scales I must find out which of these weights is this lighter one. How do I do this?

This problem is possible in just two weighs.

Slightly harder is the twelve weights problem...

I have before me twelve weights. Of which just one is slightly lighter. Using only scales I must find out which of these weights is this lighter one. How do I do this?

This problem is possible in just three weighs.

### Irregular Sudoku

Again back with another variant, this time Irregular Sudoku. Instead of your pretty boxes, you've got nasty boxes with cells all over the place, well actually I lie, this one does have one nice pretty box, can you find it?

Well smartie pants let's just see how good you are at filling it then shall we!

### Greater Than Less Than Sudoku

Well, to most people who have solved one of these in the past, Greater Than Less Than Sudoku is a good, solid variant, arrows point to the smaller of the two numbers between two cells apart from that it's a normal sudoku.

If you haven't yet solved one of these...

Where have you been, solve this one now, no, don't look back, go, go!

Only kidding, take your time in solving this one, enjoy!

### Rules for Sudoku Variants

Extra Regions Sudoku

Rules for Extra Regions Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n

1-n in each diagonal if highlighted

1-n in each coloured set (joined or unjoined)

Irregular Sudoku

Rules for Irregular Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n

1-n in each diagonal if highlighted

Greater Than Less Than Sudoku

Rules for Greater Than Less Than Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n

1-n in each diagonal if highlighted

Arrow always points to smaller value

Torodial Sudoku

Rules for Torodial Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n (blocks may wrap around to the opposite side of the grid)

1-n in each diagonal if highlighted

Rules for Extra Regions Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n

1-n in each diagonal if highlighted

1-n in each coloured set (joined or unjoined)

Irregular Sudoku

Rules for Irregular Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n

1-n in each diagonal if highlighted

Greater Than Less Than Sudoku

Rules for Greater Than Less Than Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n

1-n in each diagonal if highlighted

Arrow always points to smaller value

Torodial Sudoku

Rules for Torodial Sudoku are as follows. In any grid of n numbers,

1-n in each row

1-n in each column

1-n in each block of n (blocks may wrap around to the opposite side of the grid)

1-n in each diagonal if highlighted

### Heyawake - Divided Rooms

### Rules for Heyawake

## Wednesday, 20 January 2010

### The mighty Hitori

Phew, three puzzles in one day.

Well this is a hitori, literally meaning alone. One of my favourite types of logic puzzle to be sure.

A straightforward one but one that should be fun to solve. Also the first one of its kind I've ever designed.

For those new to Hitori here's the link to the rules

http://puzzlevalves.blogspot.com/2010/01/rules-for-hitori.html

Here's to the first of many!

### Second puzzle, it's a Nurikabe!

### Rules for Nurikabe

### Rules for Sudoku

### Woop First Puzzle

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