Fill'Em All Box Numbering Game

A very simple puzzle, based on simple rules. All you need is to fill the tiles in good order. Of course there is a catch. Each time you mark a tile, only limited number of tiles will be available for your next move. Therefore you need to find the right pattern amongst millions of possibilities to fill them all.

Rules are simple, you are only allowed to fill the tiles if they are not marked and they are away horizontally or vertically by two, diagonally by one tile.

The challenge is for real and no one on the earth has managed to reach final level.