[Help]How to bypass Unity3D Security check?

[Nexiero]

Hello,
I've recently started to learn how to hack Unity3D games, and wanted to start with .
The game is developed in Unity3D and not only browser game but you can download it on Desktop too. (40 MB installer)
Anyways, I was trying to change something in the Assembly-CSharp.dll file of the game (a file which any Unity3D game has), but it detects the change and stops loading before joining the game.
How can I bypass this check?
Thank you!