To become a good sudoku number player you must be able to "hold" a number(s) in your mind.
M13 Three-Grid Excercise
6
7
4
2
5
3
9
1
3
8
1
9
7
5
6
4
9
5
1
4
3
6
2
8
Above are three 1 to 9 number grids. Each grid is missing one number - determine the missing numbers - making a mental note of them. Now proceed to the three below grids. Determine the missing numbers in each - making a mental note of them, also.
9
4
6
2
3
8
5
7
8
3
6
7
1
2
4
9
2
1
7
5
4
9
8
6
Now recite all the above grid numbers. Repeat process until you can. (mentally repeating the numbers)
Ok, once able to do the above - proceed and determine the missing numbers in the three below grids.
1
8
9
7
5
4
6
3
4
2
6
1
3
7
5
8
3
7
5
6
8
1
9
2
Ok, now recite all the above determined missing grid numbers. Repeat this entire process on this page until you can.