Riot has been hinting that they wouldn’t mind taking League of Legends beyond Summoners Rift, and that they would like to produce some different types of games. Not sure if this is just an April Fools thing, and it only appears to be up for 24 hours, but you should definitely check out CHEW.
The basic Cho’ gath version of the game is kind of like the old Rampage games for the N64. You know how addictive these “time waster” games can be, and there are even unlockables and achievements to make sure you waste way more of your time than you thought you would. Pretty fun though! I am definitely no better at playing as Cho in CHEW than I am on the Rift