When you open the Puzzle Entry Main Menu Option, you will be presented with a blank puzzle like the one on the left.
Use the keys on your phone up down left and right to move around on the puzzle. The currently selected square is denoted in gray. It starts in position [5,5], right in the middle. Press one of the number keys 1-9 to enter that number in the square. If you make a mistake you can de-enter a number using the 0 key. (Which you can also do while playing)
Once you are finished entering the puzzle you found in the newspaper or some book switch Sudoku tutor into "playing" mode by pressing the 'Playing Key' (Left Menu Key). Thats really all there is to puzzle entry. Now you can solve the puzzle in your phone or have Sudoku Tutor teach you how to solve it by entering solver mode. (Same way you entered playing mode just choose solver now which should be where playing was in puzzle entry mode)
Showing Possibles
Showing possibles is almost like using the Sudoku Tutor solver. Except instead of just telling you what number is next it will show you what numbers are possible in all unfilled squares.
It does make puzzles very easy while learning but you should'nt use it when playing because it is sort of like cheating.
For example in the puzzle on the left with the show possibles enabled it is easy to see that
[5,1] = 7
[7,2] = 7
[9,3] = 3
[5,8] = 9
[9,8] = 1
And when you filled those you would see
that
[1,6] = 8
[8,1] = 5
[9,4] = 5
..... And you see the puzzle is very easy when this is enabled.
Entering Rough Work
While in "Playing" mode. (Modes can be switched using the menus to one of, solver or playing, or you can be in entry mode by choosing enter your own puzzle from the main menu)
Rough numbers may be entered only when in playing mode by pressing # - followed by the number you wish to enter.
If you have made an error (like I sometimes do because phone keys are small) you can un-enter rough work by pressing
# - followed by the number you wish to un-enter. Of course to enter or unenter you need to have the selection box over the square you wish to effect. The current selection box is denoted by gray. You can move it around using the arrow keys. (While In Playing Mode)
Hints
While in "playing" mode. (Modes can be switched using the menus to one of, solver or playing, or you can be in entry mode by choosing enter your own puzzle from the main menu)
You may ask for a hint by pressing the enter key (Key in the middle of all the arrow keys on your cell phones keypad).
The effect of this will be to highlight in yellow all the values that are not possible in the selected square.
In the example on the left
[5,5] cannot be
1 because of [5,3]
8 because of [4,4]
3 because of [6,4]
4 because of [6,5]
7 because of [4,6]
6 because of [5,9]
So I would then know it must be 2,5 or 9. Which I could enter as rough work if I wanted to. By pressing #-2,#-5,#-9.
Save /Load
Solver
(AKA Sudoku Tutor)
You can flip back and forth between solver and playing mode using the in game menu. Illustrated by the top left picture. One reason to switch back to playing while in solver mode is that you are not sure why an elimination was made and want to go to that square and get a hint.
There are three types of eliminations that can happen when using the solver.
The first is a simple elimination shown by the second picture on the left. This happens when there is a square with only one value possible in that square. If there are several squares like this they will all be filled in yellow at the same time and filled in one by one.
The second type of elimination is a complex elimination. Denoted by he third picture down to the left. The yellow square is the one being filled in. While the green squares are squares that the number s not possible in leaving only the yellow square where that number is possible.
Of course that leaves the "logic hole" of when there are no squares that have single values and no squares that can be automatically filled in because they are not possible elsewhere in the same column 3x3 square, or row. In this situation Solver/Sudoku Tutor makes a "guess" denoted in purple. illustrated in the fourth picture on the left.
In this way sudoku tutor is able to solve any solvable sudoku puzzle.
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