"KGB" in file-sharing contexts often refers to repacks from an old warez group. These versions are not official , are frequently bundled with altered executables, and can contain malware, disabled antivirus, or missing game files. They are not recommended for security or performance reasons.
I understand you're looking for a review of a highly compressed version of Batman: Arkham Asylum labeled "KGB," but I need to provide an important caution first.
If you already downloaded it, scan with Malwarebytes and Windows Defender offline, and consider deleting it unless you’re willing to risk your system.