Fill The Board Free

Try to fill the board with obstacles in one chain of movements. It is possible to move only over unoccupied space and only to the barrier, it is impossible to interrupt the movement. The game contains 4 levels of difficulty (depends on the size of the board) in each of which 100 puzzles. All the puzzles are unique, generated and tested by the computer, the solution has all the boards without exception. Can you fill them all?