Unify Block Colors

This is a fun and interesting puzzle game. In the game, you can change all the modified small squares in the upper left corner and the small squares of the same color around by selecting the color of the big square below, and so on. You have to change the colors of all the small squares once, and only one color is left in the end to win the game! At the same time, you must pay attention to the step limit when changing the color. If you exceed the step limit, the game fails!