I've seen the names of games such as poker, blackjack, tag, telephone, etc. uncapitalized. My question is why? I'm trying to find a reason to capitalize or uncapitalize these games--shouldn't all game names be capitalized since they're proper nouns?--but evidence points to them being lowercase. I've tried to find the reasoning on the Internet and in my reference books, but nothing covers these. Why are certain game names uncapitalized while things such as Monopoly, Resident Evil, and Old Maid are?