One of the oldest and easiest way to cheat in games is to use tools that modify values, like player score or lives, directly in device memory. There are programs also for mobile devices to do this.
HiddenVars is simple package to hide values like integers, floats, strings, arrays and others to system memory in unrecognizable format. Every time value changes, it looks totally different and changes place in memory. All values are wiped from memory when HiddenVars instance is destroyed.
For easier debugging, when testing your application in Unity Editor, you can follow the contents of all HiddenVars instances easily in Unity editor window.
All public classes and methods have full c# documentation. Documents are also online: www.leguar.com/unity/hiddenvars
Note that HiddenVars is meant to hide values during runtime only. This package doesn't contain methods to save values to any permanent storage.
Also note that no tool makes your program 100% cheat proof. With enough time, hackers can break any protections. But this easy to use package will make their work much more harder and most cheat engine kids will give up instantly.
Works in any Unity version from 4.0 forward. Tested and working also in Unity 5, 2017, 2018 and 2019.