Difficulty:
Hard
00:00
Saved Game
You have an unfinished game
Enjoy more features in the app!
Daily Challenges
Extended Statistics
Seasonal Events
Excellent!
00:00
Congratulations!
Difficulty
EasyMediumHardExpert
Time
00:00
Enjoy more features in the app!
Daily Challenges
Extended Statistics
Seasonal Events
or come back in
...
for a new game
Select a cell, then tap a number to fill in the cell
Ads help us keep our game free
Make Sudoku.com Better!
It takes less than two minutes – just answer a few short questions!
Killer Sudoku by Sudoku.com
Easybrain

# Who is hard Killer Sudoku for?

Killer Sudoku is a fun number puzzle in the family of Sudoku puzzles. There’s a common opinion that even though its name contains the word “killer”, it is actually easier than the classic sudoku. Well, not if you play a hard Killer Sudoku.

Hard Killer Sudoku levels have the same rules as any other level, the only difference is very few numbers on the grid from the beginning. This makes the game pretty hardcore and requires longer playing time to fill out all the numbers. It’s definitely a great fit for players who have had enough of the classic sudoku and want to step up their game.

## “Minimum and Maximum” strategy

A useful technique to master hard killer Sudoku levels is trying to predict the numbers in a cage. No need for a crystal ball here, it’s not as hard as it seems. If you have a cage with the value of 3, you know for sure that it’s only 1 and 2 that can be inside. The same goes for 4 as a sum of 3+1 (2+2 breaks the rule of not repeating the numbers).

Here are a few more such examples of two-cell cages:

6 (3 cells) = {1,2,3}
7 (3 cells) = {1,2,4}
16 (2 cells) = {7,9}
17 (2 cells) = {8,9}

After breaking down the cage value into numbers, don’t forget to use notes to remember them. When you have enough notes on the grid, you’ll be able to make exclusions,  the overall picture becomes clearer and you’ll master the game in a snap!

### Why you should play Killer Sudoku

While easy/medium Killer Sudoku is like jogging in terms of sports, hard Killer Sudoku is a real harcore workout for your brain. Try playing it regularly and soon you’ll be ready to take on the final boss in the world of number puzzles – Expert Killer Sudoku.

Sudoku Tips and Articles

Are you looking for a fast way to get better at solving Sudoku puzzles? Many people would like to get better at playing Sudoku but they feel like they don’t have time. They might assume that they have to buy Sudoku books or play Sudoku everyday for hours. But the truth is, you can improve your Sudoku skills just by doing a few simple things in 5 minutes or less. If you use some of these tips, you can improve your Sudoku skills in 5 minutes or less everyday: