When you get the yellow skill check, the extraction speed goes higher, but when you hit the light gray next to the yellow, it doesn't do any effect to the machine, but when you hit the dark gray spot on it, it stops extracting for a second and goes back to extracting again but also resets the sound for the machine extracting.
It was just me, I did make this, cuz I know how to make it very well! I hope you enjoy _ _ ︶