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The machine must never stop!
You are responsible for managing the inner parts of a machine. Your goal is to make the machine run, and make it run well. How do you do that? By adding a ton of cogwheels of course!
Buy cogwheel parts and combine them to build cogs, and merge your fully built cogs for better and faster ones! Making the cogs run will earn you money to buy more parts, so make sure to have plenty on your machine! Raise the income of the system by upgrading the machine and get even more money! There isn't an end for this, the machine must never stop!