The term "online mobile game rankings", when used by oldschoolers, mobile game rankings refers to sequential (non-simultaneous) multiplayer or single-player games played over a BBS, an echomail network or game concept creation locally.
Some of the most famous online free casual games (or "door role-playing games" as they were sometimes called) are TradeWars 2002, game studio locations Legend of the Red Dragon, The Pit, mobile game rankings and Operation: free online adventures Overkill 2.