Sudoku 16x16 Monster

Manual

About this manual:

This manual is intended for beginners and intermediate Sudoku players. There are many complex and detailed online Sudoku guides and manuals that you can use to learn more advanced techniques.

PART I - Notes:

The notes are hints that show the possible numbers that can be placed in a certain square. They are also called "candidates".
Populating the notes manually is a lengthy process for such a big puzzle and can take a few hours. On the positive side - you will probably solve 1/3 of the puzzle while working on the notes.
You can always use the AutoFill feature to populate the notes automatically and keep them in sync.
This manual assumes that the notes (candidates) are manually or auto populated and correct.

Part II - Squares with a single note:

If a square ended up with only one note - this means that there is only one possible number that can be put there. Just replace the note with the number.
You can use one of the double-click/Enter key shortcuts - double click it or press Enter when selected and the note will become the number. After each move you make - scan the grid for such squares.
Example:

Part III - One Unique note in a row, column or 4x4 box:

A row, column or box can have all kinds of notes populated in their squares. But if one note appears only ONCE in the set of notes part of row, column or box - you can safely put the number of this note in the square, regardless of the other notes in that square, row, column or box.
Example:

This is a very useful technique. The hard part is to find such notes. They are easier to spot in a box than in a row or a column. Some suggestions of how to find such unique notes:
- Scan the grid for open numbers that appear more often the others. When you find such a number scan the boxes, rows, and columns for unique notes of this number.
- When you find a unique note and put its number in the square - scan the same row, column and box for other unique notes. Often you can find more than one.
- Use the Number-Finder feature to speed the process.

Part IV - Repeated note pairs:

If two same notes are only present in two squares that are part of a box, row or column, this means that those two numbers can be present only in the two squares. So you can safely eliminate/remove the notes for the two numbers from all other squares in the row, column and box. By doing this you can find squares with a single note (See Part II) or other repeated notes pairs.
Example:

Part V - Repeated note triples:

If 3 squares (part of a box, row or column) only have notes for the same 3 numbers - this means that those 3 numbers can be present only in the 3 squares.
So you can safely eliminate/remove the notes for the 3 numbers from all other squares in the row, column and box.
Not all of the 3 numbers need to be present in each square - as long as they are unique and present only in the 3 squares - the same rule applies.
Examples for valid combinations:
12F 12F 12F, ABC ABC AB,
1FA 1FA FA, 5EF 5F 5E(example bellow),
AB AC CB, 23 3A 2A(Part VI example).

Part VI - Hidden repeated note pairs:

The hidden pairs are just like regular repeated pairs(See part IV), but are hidden among other note candidates and therefore more difficult to spot.
When two same notes are only present in two squares part of a box, row or column, even though there are other candidates in the same squares - you can treat those notes as a regular repeated note pairs. You can safely eliminate the other notes from the two squares. Example:

In the example you can eliminate the "3" and "2" candidate from the squares with "35D" and "25D" notes.
NOTE: You can achieve the same result if you process the repeated note triple 23 3A 2A.

You can apply the same principle for hidden repeated note triplets if you manage to locate them.

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