The goal is to replicate the colored knitting pattern at the top of the screen. To do this, you must tap and drag a line from a spool of thread to the matching colored section on the pattern. Continue this process until the entire pattern is filled with the correct colors.
Pay close attention to the symbols on the spools. Some spools have an infinity symbol (∞), indicating an unlimited supply of thread. Other spools have a number (e.g., 2, 3), which signifies a limited amount of thread that can only fill that many squares. Be careful not to waste thread from limited spools, as you may need it for other sections later.
Before starting, plan your moves by observing the entire board. It is best to use the spools with a limited amount of thread first, preferably on smaller, corresponding color patches. Use the unlimited spools to fill in the larger sections of the pattern. Using up a spool clears its space, which can cause new spools to drop down and help you complete the puzzle.