Game hacking questions.

It is a mobile game. I know that someone can see the code of the game through unpacking(?). If so what values can be modified if a hacker hacks the game? Runtime or before. 1. PlayerPrefs data 2. Class field variables, local variables, const variables 3. The code itself. such as `if (i > 10) { }` -> `if (i > 15) { }` 4. Something else