Sudoku - easy

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Sudoku - easy

When you fill a square with the correct digit, the number will turn green, but at a certain point of the game it is possible that more digits could be correct. If at that certain point the digit is incorrect, it will turn red. It is possible that after filling the other squares, some of the digits written down previously won’t be correct anymore. In this case the number won’t change its color, you’ll have to find the incorrect digit in the grid.
We recommend the easiest version of Sudoku to those who are new to the game. At ‘easy’ level, the board already contains 45 digits at the beginning of the game. Even beginners can start the game from this position without difficulty, then, after a bit of practice, they can enjoy this excellent logic puzzle even on the more difficult levels. The goal of the game is to fill the 9×9 grid with digits from 1 to 9 in such a way that every number can appear only once in each row and in each column, also taking into consideration that each subgrid consisting of 9 squares can contain these numbers only once.
sudoku easyIf you select the easiest level, there are already 24-25 digits in the grid when you start the game. In round figures it means 30% of the grid.
The general problem of solving Sudoku puzzles on n2×n2 grids of n×n blocks is known to be NP-complete. The number of classic 9×9 Sudoku solution grids is 6,670,903,752,021,072,936,960, or around 6.67×1021