Anyone else addicted to these things?
The rules are very simple. Every row must have the numbers 1-9 once, every column must have 1-9 once, and every 3x3 box with the thick outline must have 1-9 once. There is only ever one correct solution. It's a game of logic.
You always get given a few numbers to start with. This one is only 'moderate', there are much tougher sudoku out there.
I'll tell you why the 5 and 8 are correct to get you started.
Firstly the red 5: The lower right box must have a 5 in it somewhere. It cannot be in the lower 2 rows as there is a 5 in both these rows already (see the other 2 lowest boxes). It cannot be in the right of middle columns as there is a 5 in these columns already (see the 2 boxes above the lower right box). Therefore the top left square of the lower right box must be a 5.
The green 8: There must be an 8 in the row where we just put the red 5. The 8 cannot be in the last two squares of the row as there is already an 8 in that box. The 8 cannot be in the square in the middle box as there is already an 8 in that column (see top middle box). Therefore the 8 must be the very first square of the row.
First person to complete it gets... I dunno something.
The rules are very simple. Every row must have the numbers 1-9 once, every column must have 1-9 once, and every 3x3 box with the thick outline must have 1-9 once. There is only ever one correct solution. It's a game of logic.
You always get given a few numbers to start with. This one is only 'moderate', there are much tougher sudoku out there.
I'll tell you why the 5 and 8 are correct to get you started.
Firstly the red 5: The lower right box must have a 5 in it somewhere. It cannot be in the lower 2 rows as there is a 5 in both these rows already (see the other 2 lowest boxes). It cannot be in the right of middle columns as there is a 5 in these columns already (see the 2 boxes above the lower right box). Therefore the top left square of the lower right box must be a 5.
The green 8: There must be an 8 in the row where we just put the red 5. The 8 cannot be in the last two squares of the row as there is already an 8 in that box. The 8 cannot be in the square in the middle box as there is already an 8 in that column (see top middle box). Therefore the 8 must be the very first square of the row.
First person to complete it gets... I dunno something.
