Solution to Sudoku no 440

Sudoku no 440 (Moderate)

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Solution to Sudoku no 439

Sudoku no 439 (Tough)

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Solution to Sudoku no 438

Sudoku no 438 (Extreme)

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Solution to Sudoku no 437

Sudoku no 437 (Extreme)

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Solution to Sudoku no 436

Sudoku no 436 (Easy)

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Solution to Sudoku no 435

Sudoku no 435 (Tough)

This puzzle has a similar level of difficulty to the ones in my book, Tough Sudoku Volume 1.

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Solution to Sudoku no 434

Sudoku no 434 (Diabolical)

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Solution to 3 by 3 Puzzle no 1

Here is my original version of the solution:

...and here is another version from Arun Arunasalam, who works in the same office as me:

3 by 3 Puzzle no 1

I worked out the numbers for this puzzle using Oracle Database Express Edition. I created the image below using Microsoft Paint.

Fill in the empty boxes so that each of the numbers 1 to 9 is used exactly once. The number in each circle is the sum of the surrounding 4 digits:

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Solution to Sudoku no 433

Sudoku no 433 (Tough)

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Solution to Sudoku no 432

Sudoku no 432 (Extreme)

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Solution to Sudoku no 431

Sudoku no 431 (Easy)

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Solution to Sudoku no 430

Sudoku no 430 (Tough)

Our younger son created this puzzle using a Node.js program which he wrote himself:

 

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Solution to Puzzle no 12

cede
clomp

clomped

code

come

comet

compel

compete

competed

complete

completed

cope

coped

cote

deem

deep

demo

demote

depot

doe

dole

dome

dope

dote

eel

elect

elm

elope

eloped

emote

emoted

led

lee

let

lode

lope

loped

meet

meld

melt

melted

met

mete

meted

mode

model

mole

mope

moped

mote

motel

ode

opted

pee

peed

peel

pelt

pelted

pet

poem

poet

pole

tee

teed

teem

temp

temped

temple

tempo

toe

tome