This granny square is a lot different than the normal one. It goes in spiral rounds and requires a constant change in colors. But it’s your choice on how many yarn colors you choose. In my opinion, it’s real beauty is shown only when different colors are used.
I have used 4 colors: yellow,pink, purple and white. It’s totally up to you what you use. The stitches used in this pattern are sc,hdc,dc .