[C#] Multi level pointers

//API Declaration :

  [DllImport("kernel32.dll")]
    static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAdress,  byte[] lpBuffer, uint iSize,out uint lpNumberOfBytesRead);

    [DllImport("kernel32.dll")] // Overload for ptr
    static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAdress, out IntPtr lpBuffer, uint iSize, out uint lpNumberOfBytesRead);

//........

     public int Readlvl1Pointer(IntPtr adress)
    {
        uint bytesRead;
        byte[] _Value = new byte[4];

        ReadProcessMemory(_targetProcessHandle, adress, _Value, (uint)IntPtr.Size, out bytesRead);
        int ptrVal = BitConverter.ToInt32(_Value, 0);
        IntPtr ptr = (IntPtr)ptrVal;
        ReadProcessMemory(_targetProcessHandle, adress, _Value, (uint)IntPtr.Size, out bytesRead);

        return BitConverter.ToInt32(_Value, 0); // This function is working fine
    }

    private IntPtr ReadPointer(IntPtr adress)
    {
        IntPtr tempPTR;
        uint NumberOfBytesRead;

        ReadProcessMemory(_targetProcessHandle, adress, out tempPTR, (uint)IntPtr.Size, out NumberOfBytesRead);
        return tempPTR;
    }

    public IntPtr FollowPointer(IntPtr adress, ulong[] Offsets) // To get the final adress
    {
        IntPtr ptr = ReadPointer(adress);
        for (int i = 0; i < Offsets.Length; i++)
        {
            ptr = ReadPointer(new IntPtr(ptr + Offsets[i])); // error here, can't add IntPtr to IntPtr
        }
        return ptr;

    }

IntPtr finalAdress = m.FollowPointer((IntPtr)0x0631390, {0xC,0x14,0});  // Don't know why I always have to convert here
m.WriteInteger(finalAdress,[new value here]);

Console.WriteLine(m.ReadInteger((IntPtr)0x7F758));