Marker 1
Grid Size Width 5 Height 5

Input Action
Backspace
Delete
Right-Click
Clears a square.

(Only if a number is present)
1-8
Right-Click
Marks a square with a number.
(Only if a number is absent)

On the Subject of a Coordinate Grid

Column first or row first?

All information pertaining to the module can be found in the original manual.

Table 1: grid size formats

FormatHow to interpret
xThe number x is a product of two primes. The grid’s width is the larger prime, the height the smaller.
(x)Same as x, but width and height are swapped.
x×yx is the width, y the height of the grid.
x by yx is the height, y the width of the grid.
x*yx is the total size of the grid, y the height.
x : yx is the total size of the grid, y the width.

Table 2: grid location formats

[x,y]Column, then row; top-left is [0,0].
letter numberColumn, then row; top-left is A1.
<x, y>Row, then column; top-left is <0, 0>.
x, yRow, then column; top-left is 1, 1.
(x,y)Column, then row; bottom-left is (0,0).
letter-numberColumn, then row; bottom-left is A-1.
x, yRow, then column; bottom-left is “0, 0”.
x/yRow, then column; bottom-left is 1/1.
[x]Cell number in scanline order[1]; top-left is [0].
xthCell number in scanline order[1]; top-left is 1st.
#xCell number in Cartesian order[2]; bottom-left is #1.
四十七Cell number in Chinese reading order[3]; top-right is 一. See Table 3 for Chinese numerals reference. The example shown here represents the number 47.

Table 3: Chinese numerals

16
27
38
49
510

[1] Scanline order, also known as reading order, starts at the top-left, moves right across the row, and then continues likewise with each row from top to bottom.

[2] Cartesian order, also known as geometric order, starts at the bottom-left, moves right across the row, and then continues likewise with each row from bottom to top.

[3] Traditional Chinese reading order starts at the top-right, moves down the column, and then continues likewise with each column from right to left.