KenKen 6x6 Puzzles to Solve Without Scratch Paper

Lately I have been challenging myself to solve 6x6 puzzles without using scratch paper for factoring or other figuring.  Below is a link to a file folder full of the puzzles I have solved in this way, and using deductive logic alone without recourse to trial and error.

Some helpful things to remember:

1.  The numbers in each row and column must add up to 21.

2.  Numbers divisible by 5 all end in 0 or 5.

3.  Numbers divisible by 3 all have digits that add up to a multiple of 3.  For example, take 24:  the digits 2 and 4 add up to 6 which is a multiple of 3.  This fact comes in handy for quickly determining factors for larger numbers.

Here is the link to a set of puzzles you can print out and solve:

                                        Puzzles to Solve

   

KenKen Puzzle Number 42 - 7x7 Normal Difficulty

Solution for KenKen Puzzle Number 42

KenKen Puzzle Number 41 - 7x7 Normal Difficulty

 

 Solution for KenKen Puzzle Number 41

KenKen Puzzle Number 40 - 7x7 Normal Difficulty

Solution for KenKen Puzzle Number 40

KenKen Puzzle Number 39 - 7x7 Normal Difficulty

Solution for KenKen Puzzle Number 39

KenKen Puzzle Number 38 - 7x7 Normal Difficulty

This continues our series of 7x7 KenKen puzzles of normal difficulty. 

 Solution for KenKen Puzzle Number 38

KenKen Puzzle Number 37 - 7x7 Normal Difficulty

We now begin a series of 7x7 puzzles of normal difficulty:

Solution for KenKen Puzzle Number 37

KenKen Puzzle Number 36 - 6x6 Normal Difficulty

Here is our sixth and final 6x6 normal difficulty puzzle in this series:

 

 The Solution to Puzzle 36: 6x6 Normal Difficulty

KenKen Puzzle Number 35 - 6x6 Normal Difficulty

 The Solution to Puzzle 35: 6x6 Normal Difficulty

KenKen Puzzle Number 34 - 6x6 Normal Difficulty

Another 6x6 puzzle of normal difficulty.  This one required some tricky reasoning before everything fell into place.

 The Solution to Puzzle 34: 6x6 Normal Difficulty

KenKen Puzzle Number 33 - 6x6 Normal Difficulty

Yet another 6x6 puzzle of normal difficulty:

 The Solution to Puzzle 33: 6x6 Normal Difficulty

KenKen Puzzle Number 32 - 6x6 Normal Difficulty

We continue with 6x6 puzzles of normal difficulty:

The Solution to Puzzle 32: 6x6 Normal Difficulty

KenKen Puzzle Number 31 - 6x6 Normal Difficulty

This is the first of a series of normal difficulty 6x6 puzzles from the free Mathdoku App.  For 6x6
problems we use the numbers 1 thru 6 and each row or column will total 21.

These puzzles often involve factoring numbers down and seeing how many possibilities there are.  The solution for this puzzle includes extended explanations for reducing the factors to a set of possibilities.

The Solution to Puzzle 31: 6x6 Normal Difficulty

KenKen Puzzle Number 30 - 5x5 Normal Level

This is another normal difficulty 5x5 puzzle from the free Mathdoku App.
 

 And here is...  

The Solution for Puzzle 30 of our Series

KenKen Puzzle Number 29 - 5x5 Normal Level

This is another normal difficulty 5x5 puzzle from the free Mathdoku App.
 

 And here is   

The Solution for Puzzle 29 of our Series

KenKen Puzzle Number 28 - 5x5 Normal Level

This is another normal difficulty 5x5 puzzle from the free Mathdoku App.
 

 And here is   

The Solution for Puzzle 28 of our Series

KenKen Puzzle Number 27 - 5x5 Normal Level

This is a normal difficulty 5x5 puzzle from the free Mathdoku App that you can download and use on your phone or tablet.  This free app provides endless different puzzles of all sizes and levels of difficulty and has many interesting features

The Washington Post provides a version you can do online through your browser:    

Washington Post Mathdoku

 And here is   

The Solution for Puzzle 27 of our Series

KenKen Puzzle Number 26 - 5x5 Normal Level

This is a normal difficulty 5x5 puzzle from the free Mathdoku App that you can download and use on your phone or tablet.  This free app provides endless different puzzles of all sizes and levels of difficulty and has many interesting features.

The Washington Post provides a version you can do online through your browser:    

Washington Post Mathdoku

 And here is   

The Solution for Puzzle 26 of our Series

KenKen Puzzle Number 25 - 5x5 Normal Level

NOTE:  This begins a series of normal difficulty 5x5 puzzles which are excellent as a daily puzzle that is challenging but not too difficult or time consuming.  

 

This is a normal difficulty 5x5 puzzle from the free Mathdoku App that you can download and use on your phone or tablet.  This free app provides endless different puzzles of all sizes and levels of difficulty and has many interesting features.

The Washington Post provides a version you can do online through your browser:    

Washington Post Mathdoku

 And here is   

The Solution for Puzzle 25 of our Series

Puzzle Solution Index

 INDEX OF PUZZLES AND SOLUTIONS 

Not familiar with KenKen puzzles?  Learn all about them at the

 KenKen Puzzle Introduction with Sherlock Holmes

Once you understand the puzzle you can see how some simple logical deduction can be applied to these problems:

Strategies For Deduction

Beginners can also check their calculations with a variety of free online...

KenKen Calculators for Factoring and Checking Possibilities

There are many free online versions of KenKen appearing under other names:
 

 By Many Other Names - KenKen Clones

The solved puzzles:

These puzzles are listed in order from easiest to hardest (Puzzles 1-22).  

Puzzles 23 and 24 are 5x5 Puzzles with some interesting strategies used for their solution.

Puzzles 25-30 are a series of 5x5 normal difficulty puzzles that are excellent as a daily puzzle that is not too difficult or time consuming.  This series should be helpful for beginners who want some example solutions.

Puzzles 31 begins a series of 6x6 normal difficulty puzzles that are more challenging than the 5x5s. 

Puzzle 37 begins a series of 7x7 normal difficulty puzzles that increase the challenge.

• KenKen Puzzle Number 1 - 4x4


• KenKen Puzzle Number 2


• KenKen Puzzle Number 3


• KenKen Puzzle Number 4 - 5x5


• KenKen Puzzle Number 5


• KenKen Puzzle Number 6


• KenKen Puzzle Number 7 - 6x6


• KenKen Puzzle Number 8


• KenKen Puzzle Number 9


• KenKen Puzzle Number 10


• KenKen Puzzle Number 11


• KenKen Puzzle Number 12


• KenKen Puzzle Number 13 - 7x7


• KenKen Puzzle Number 14


• KenKen Puzzle Number 15 - 8x8


• KenKen Puzzle Number 16


• KenKen Puzzle Number 17 - 9x9


• KenKen Puzzle Number 18


• KenKen Puzzle Number 19


• KenKen Puzzle Number 20


• KenKen Puzzle Number 21


• KenKen Puzzle Number 22


• KenKen Puzzle Number 23: Interesting row summing


• KenKen Puzzle Number 24: Using a tree diagram 

 

Series of 5x5 Normal Level Puzzles

KenKen Puzzle Number 25: 5x5 Normal Level 

 

KenKen Puzzle Number 26: 5x5 Normal Level 

KenKen Puzzle Number 27: 5x5 Normal Level 

KenKen Puzzle Number 28: 5x5 Normal Level 

KenKen Puzzle Number 29: 5x5 Normal Level 

KenKen Puzzle Number 30: 5x5 Normal Level 

 

Series of 6x6 Normal Level Puzzles

KenKen Puzzle Number 31: 6x6 Normal Level 

KenKen Puzzle Number 32: 6x6 Normal Level

KenKen Puzzle Number 33: 6x6 Normal Level

KenKen Puzzle Number 34: 6x6 Normal Level  

KenKen Puzzle Number 35: 6x6 Normal Level

KenKen Puzzle Number 36: 6x6 Normal Level

Series of 7x7 Normal Level Puzzles

KenKen Puzzle Number 37: 7x7 Normal Level

KenKen Puzzle Number 38: 7x7 Normal Level

KenKen Puzzle Number 39: 7x7 Normal Level

KenKen Puzzle Number 40: 7x7 Normal Level

 KenKen Puzzle Number 41: 7x7 Normal Level

 KenKen Puzzle Number 42:7x7 Normal Level

 KenKen 6x6 Puzzles to Solve Without Using Scratch Paper