Sudoku is a popular game that has many variations in the rules. This blog post will go over some of the different terms and definitions for Sudoku!

The numbers in the grid are called “squares” and each row, column, or region is referred to as a “region”.

An empty location is called “a cell” or “square”.

Naked pair: A pair of numbers that are next to each other but only one number is used within the row, column or region.

Hidden single: A single number that does not have a neighbor to its left or right.

Digits: Letters used in the puzzle, these are typically “N,E,S,W” and “A”, “B”,”C”,”D”.

Line: A horizontal row or vertical column.

Pencil Mark: A number or letter that is selected as a possible answer.

Grid: It’s the layout of the puzzle in rows and columns, for example, A12 is a row and B14 is a column.

Pair: Two numbers next to each other on the same line or column.

Square: It’s a location in the grid, for example A14 is a square on row “A” and column “B”.

Region: A row, column or area on the grid.

Cross Hairs: The lines that divide a region into four smaller regions.

Block: Usually refers to the layout in which there is a block of four or more squares, all containing digits that have not been used in the current puzzle.

Killer Square: A square that contains two digits, one of which would complete a hidden pair if it were added to the same row, column or region.

Templates: A filled grid where you can see which squares need to be crossed off.

Hidato: A simple variant of Sudoku In Hidato, there cannot be any horizontal lines containing only zeros within any single row nor vertical line containing no numbers whatsoever within any single column – this ensures that every row and column has some pattern of numbers.