It is necessary to touch the glass in order to pour sand of the same color into different cups and sort them in this game called Join & Strike. A flower will form on the surface of a glass after a color is poured into it. As a result, this is a demanding game for your head. You have the option of restarting the level if you become stuck in the problem. Gather coins as you go through each level; there is a shop where you can spend your earnings to purchase new glasses. Have a good time.