LEGO Games v1

"
Security:
-> Custom Checksum
   -> Offset: Size - 4
   -> Calculation Start: 0
   -> Calculation Length: Size - 4
"

private int CalculateChecksum(byte[] data) {
    using (var xIO = new MasterIO(data, Endian.BIG)) {
        int count = (data.Length / 4) - 1;

        int sum = 0x5C0999;
        for (int i = 0; i < count; ++i)
            sum += xIO.Reader.ReadInt32();

        return sum;
    }
}