Sudoku: Easy to impossible play online

Fill in missing numbers as fast as possible and start with the most difficult grid!

What is this
Sudoku is a game where you try to fill in the missing numbers. The numbers must satisfy some rules. They must be whole numbers from 1 to 9, they must not repeat in each row and each column. Numbers also must not repeat in each smaller 3x3 grid.

Why
This is a simple game for mental workout. Puzzle solving in general is great for our brain. The challenge can be as hard or easy as desired. Every game is timed and number of mistakes is tracked so the game can be played with competition in mind. Nevertheless the game itself is fun and can be played just for fun.

How to use and play this app
Firstly start the game by choosing the difficulty. It can be from very easy (1) to almost impossible (10). The game is automatically saved after each move and it is saved until it is completed or it is deleted from saved games. If there are games to be resumed the button will appear to resume saved game(s). There is also draft or note mode. Instead of inputting the number, a small number can be chosen to illustrate notes or possibilities. Undo button removes your inputs in reverse order and notes are ignored. Delete button deletes everything that is inside chosen location. In the toolbar at the top there is also a restart button. It removes every input and all notes to start over. The button can be hidden in the options. The game has at least three goals: solve the hardest grid, solve as fast as possible and have as much fun as possible.

There are some helping options. By default the options for wrong number warning, same number highlight and underlining input number if there are more then 9 numbers in grid are turned on. Also the timer display is on by default. These options can be easily changed even mid game. There are two types of input mode. One is to first choose position and then the number. The other is to first choose the number and then position in the grid. There is also an option for dark mode.

Verification of the current grid status is very powerful tool for quickly solving any grid. If used in excess it takes away from challenge that solving puzzles bring. Because of that verification for daily challenges and campaign is removed. But can always be there for normal games as chosen in options.

Features
classic simple design
lots and lots of starting grids
daily challenges
campaign
19 levels of starting grid difficulty
grid verification during game
counting mistakes
light and dark mode

If you find some bugs please report them to us at [email protected]. All feature requests are welcome!