Walking on air!
This isn't really a hint, but it is pretty cool. As the title suggests, you can make your workers walk on air! All you have to do is start making a car, the when your worker falls down because of lack of doughnuts, just tap the doughnut icon and while he shoots up into the air, tap the car and he will walk towards the car in the air. (the worker cannot be to close to the car for it to work.)
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