Your goal is to fill the target spools in the center of the screen. At the bottom, small spools are arranged inside layered constructions. You can only take spools that are unblocked — those not covered by other platforms. Select an available small spool and send it to the matching color target spool. When a target spool collects three matching spools, it is completed and the thread is automatically sent forward. Clear all required target spools to complete the level.