Thread:Deathstalker666/@comment-1496755-20150904120435/@comment-1496755-20150909052244

Secret? Hidden object? I have no idea what you're talking about :P

Actually, I think CoD 4 had a bunch of hidden objects, and the purpose of collecting them was to unlock some sort of "cheat options". But they weren't exactly hidden - you just had to be reasonably thorough and you'd find them all.