The primary objective is to complete the knitting pattern at the top of the screen by filling spools with colored thread. To generate thread, you must merge discs of the same color in the puzzle grid at the bottom. This is done by dragging one disc onto another matching one. Some discs have numbers on them; merging these with a plain disc of the same color will reduce the number by one. You must continue merging these numbered discs until the number reaches zero to clear them from the board. Once a spool at the top is 100% full, tap on it to use the thread for knitting. This action clears the spool from its slot, allowing a new one to appear. To win the level, you must continue this cycle of merging discs to fill spools and using the spools to knit until the entire pattern is complete.
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A good strategy is to prioritize merging colors that match the spools currently available and to focus on clearing the numbered discs to free up space on the grid. Upon completion, you will be rewarded with coins.