Here's a game to stimulate your thinking (well ok, just your recall of long-term memory) in addition to your motor skills, though you do have to register to play.
InteracTrivia is a multiplayer, interactive, online trivia game allowing users to go head-to-head against other players around the world in a battle of knowledge - all happening in real time. Players compete against one another in four exciting rounds of fun trivia scoring points by answering questions quickly - and correctly - to fight your way to the top of the leaderboard.
Just like your television, InteracTrivia offers a variety of different game channels for your trivia enjoyment. Channels devoted to specific categories of knowledge, themes or user levels allow you to pick the game that is right for you...