The cog factory has cut back on its workforce leaving only you in charge of sorting all the cogs used to make their 'machine'. Your objective is to group the same colored cogs together in sprocket spirals. Once three or more cogs of the same color are adjacent to one another, they will disappear and connect themselves to the 'machine' in the background. The number of sprocket spirals increases as you progress through the game and the 'machine' gets built.
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