Hitori 9x9 #1 Light

In Hitori 9x9 #1 Light is played on a square grid. At the beginning, all cells contain numbers. The goal is to paint several cells so that there are no duplicate numbers in any row or column, as in the enabled state of Sudoku puzzles (except that black squares are added to the grid).

Orthogonal connections are also important; Colored (black) cells cannot be connected orthogonally, and the remaining cells must be connected orthogonally in one group (i.e. no two black squares can be adjacent to each other, and all unpainted squares must be connected horizontally or vertically, so that create a single form).