private function processGameStart()
    {
        $this->syncChecksumInterval = $this->readBody('l', 4);
        if ($this->version->isMgl) {
            // not sure what difference is vs mgx and up
            $this->position += 28;
            $ver = ord($this->body[$this->position]);
            $this->position += 4;
        } else {
            // These are also stored in the header.
            $isMultiplayer = $this->readBody('l', 4);
            $pov = $this->readBody('l', 4);
            $revealMap = $this->readBody('l', 4);
            $this->containsSequenceNumbers = $this->readBody('l', 4);
            $this->numberOfChapters = $this->readBody('l', 4);
        }
    }