Left 4 Dead 2 is a well-known co-op survival horror game developed by Valve. The "build16169696" is probably a build number, which might refer to a specific version or patch of the game. The term "repackkaos" sounds like a portmanteau of "repack" and "Kaos," which could be the creator or distributor of the repack. The user is asking for a better version or maybe the story behind it.