The target of this puzzle is to try your best to fill the whole tiles on the grid.
But you have to move with following the rule of Horse in Chinese Chess. According to the rule applied in Northern Song Dynasty, the Horse could jump over even if there is a foot block. Specific movement rule : each round the Horse can move two steps along a straight line in any direction and then move one step along the vertical line. e.g. Jump like on the Sun in Chinese language, so called "Horse Jump the Sun".
UP is so nice to provide hints of tiles that could be tapped in each round. But you still need take care of not being trapped!
Have fun!