The number in each square
represents exactly
how many Squares must be
painted red near The square
(both adjacent and diagonally )
For example ,if the number says 9,
You know all squares next to
the Square and
the square itself
must Be painted red .
On the other hand ,if the number
say 4 ,there are 4 red squares
and the Rest are white.
If the number say 0 ,You know
that All squares should be painted white.