In short, you can start solving a puzzle on one device and continue on another, but you can't solve it on two devices at the same time. In Killer Sudoku there’s a new concept of a “cage” – a group of cells within a dotted line that make up a sum shown as a small number above. Although solving Killer Sudoku online seems a bit harder than classic sudoku, we made it accessible for players of all skill levels. If fill uses cage combinations is enabled, the FILL button will only add the numbers 1 2 3 4 to cells within the cage.

Killer Sudoku online - Solve daily killer sudoku puzzles

In other words, it (a) undoes all changes to cage combinations since the last cell change, (b) undoes the last cell change, and (c) undoes all changes to cage combinations since the previous cell change.Daily Killer Sudoku sessions are said to help you train your brain, improve memory, concentration and logical thinking. Make sure the sum of numbers in each cage is equal to the number in the upper left corner of the cage. Notes/pencil marks are small numbers that you can enter into cells when you aren't yet sure of the final answer. It’s also known by such names as sumdoku, addoku and sumoku puzzle but in a nutshell it’s pretty much the same number puzzle. As you browse through the archives, you'll be able to see which puzzles you've solved and your solving times.

The Times Puzzles: Crosswords, Sudoku and more

Whether you’re waiting for plane boarding, stuck in a queue or just want to unplug from reality for a few minutes, Killer Sudoku should be your number puzzle of choice.Like in Sudoku, your ultimate goal is to fill the grid with numbers, while paying attention to ”the sum rule”. A puzzle's difficulty level is estimated when it's generated, whereas the average solving time is the result of people solving it. Highlight the cells in multiple complete cages, and their combined sum will be displayed in the Combinations control.