Description

Do you know？
Sudoku is a relatively new game. It started in 1970s in America. In1980s a Japanese magazine officially named this game "Sudoku". Itmeans that there is only one number in each grid. Ever since then,it's getting more and more popular in Japan. Around 2005, it becamea worldwide common game, due to the popularity of theInternet.

Game rules
Sudoku game board contains 81 grids in 9 blocks, made up of 9 rowsand 9 columns. The purpose is to put 9 numbers in blank grids andmake sure that all 9 numbers in each row, each column and eachblock are all different.

How to play:
1. Choose a grid.
2. Select one number based on the game rules.
That's it!

Game help
Here are the tips to help you locate answers much quicker:
1. Highlight: when you choose any number on the board, all the samenumber that has been filled in will be highlighted! Now it becomeseasier, right? If you don't want this, you can simply turn it offon the settings page.
2. Hint: When you get stuck, choose a grid and tap on the lightbulb in the upper right corner. You will find the answer of thatgrid will just popup by itself! Please notice: the number of usedhint will affect your final score!

Notice:
Three clears in one level will bring you to the higher difficultylevel!