How to make a C# loop for a game?

Question

Unity

I'm making a game (casual, arcade) and because I'm new to programming, I have a problem. I need such a cycle: so that with each +20 in the score, the speed of falling balls changes (but this is not the point). I can then write if the score is 20, then the speed is exactly 4. But this way I will get a very long code. You do not pay attention to speed or something else, the main thing for me is to make a cycle so that one variable is dependent on another. I hope the point is clear.)

Answer 1

What is the cycle here - mathematics grade 3, divide the points by 20 and get the speed level, and then you will make a map - at what level what speed.