Sequels separately if they have different names, genres, or anything. If everything is identical except something like the number in the name that indicates what it's iteration in the series, NAME HERE 1/2/3/4 is ok.
Also your list showed me a silly flaw I overlooked; A game can be online play only, or can be offline and support online play. Changed the multiplayer part to add:
O = Online only
SO = Supports online play, but can be played offline
Stealth genre added.
I forgot about the mobile devices too.