Ad Notice
This game is exclusively available through a publisher who has built ads into the game files. Because of this, we are unable to remove the ads for subscribers, like we do for all the other pages of the site.
Killer Sudoku
3.5 / 5(633 Votes)Instructions
Tap on a square and type the number you want to fill in the square. Like regular Sudoku, you use the numbers 1-9 in the 3x3 boxes on the grid. Each number can only appear once in a box, but can't be repeated in the same row or column.
There's a new challenge, and it involves some math! In the upper left corner, some squares will have a number and a group of boxes around it are the same color. As you fill in the squares, you have to make sure your answers add up to the corner number.
If the number you type in is red, that means the number doesn't belong in that spot. If the number is black, that means you put it in the right place!
HINT: If you're stuck, click the lightbulb and you can reveal the answer to a certain square (or reveal the entire puzzle!)
Click on a square and type the number you want to fill in the square. Like regular Sudoku, you use the numbers 1-9 in the 3x3 boxes on the grid. Each number can only appear once in a box, but can't be repeated in the same row or column.
There's a new challenge, and it involves some math! In the upper left corner, some squares will have a number and a group of boxes around it are the same color. As you fill in the squares, you have to make sure your answers add up to the corner number.
If the number you type in is red, that means the number doesn't belong in that spot. If the number is black, that means you put it in the right place!
HINT: If you're stuck, click the lightbulb and you can reveal the answer to a certain square (or reveal the entire puzzle!)
How to play Killer Sudoku on your phone
Did you know you can also play Killer Sudoku on your phone? It’s a great way to play without worrying about losing your save data.
For iOS devices, simply tap the "Share" icon 
in Safari and select "Add to Home Screen". For Android devices, tap the “Menu” icon 
and select "Install App".
Ad Notice
This game is exclusively available through a publisher who has built ads into the game files. Because of this, we are unable to remove the ads for subscribers, like we do for all the other pages of the site.
Game Progress
3.5 / 5(633 Votes)Instructions
Tap on a square and type the number you want to fill in the square. Like regular Sudoku, you use the numbers 1-9 in the 3x3 boxes on the grid. Each number can only appear once in a box, but can't be repeated in the same row or column.
There's a new challenge, and it involves some math! In the upper left corner, some squares will have a number and a group of boxes around it are the same color. As you fill in the squares, you have to make sure your answers add up to the corner number.
If the number you type in is red, that means the number doesn't belong in that spot. If the number is black, that means you put it in the right place!
HINT: If you're stuck, click the lightbulb and you can reveal the answer to a certain square (or reveal the entire puzzle!)
How to play Killer Sudoku on your phone
To play Killer Sudoku easily any time, you can add it directly to your phone as an app. It’s a great way to play without worrying about losing your game save data.
For iOS devices, simply tap the "Share" icon in Safari and select "Add to Home Screen". For Android devices, tap the “Menu” icon and select "Install App".
Votes