Function Ball（関数球）

You input any function to guide the red ball on the xy-plane to the goal.
There are also stages with obstacles and wind.
Let's take these into account and think of a function that will lead us to our goal.

Video distribution guidelines
You may distribute it without permission, regardless of whether you are an individual or a corporation.
Monetization is only possible using the functions provided by the video distribution site.
We would appreciate it if you could include the name of the game in the title of the video or distribution, and include a link to the Steam page in the summary section.

Notes
Functions with a large rate of change in a given domain may not be sampled properly, but please note that this is a specification of this game.