sudoku definition by Wordo

Noun

A

type

of

pencil

puzzle

played

on

a

square

grid

,

requiring

each

of

the

columns

,

each

of

the

rows

,

and

each

of

the

subregions

(

called

"

boxes

"

or

"

regions

")

to

contain

the

lowest

whole

numbers

up

to

the

dimension

of

the

puzzle

,

usually

1

to

9

,

once

each

.

The

subregions

are

rectangular

or

square

except

in

variants

.