The Roundabout game is completely crackers. You play the role of Georgio Manos, 'arguably the world's most famous revolving chauffeur'. Your job is to drive a bunch of wacky characters around the town of roundabout using a constantly rotating limousine.
The game is a fantastic example of how an interesting movement mechanic (timing the moves of your spinning car around obstacles including, er, roundabouts) has been used as the basis of a weird but wonderful narrative built around the strange folk who want to be taken for a ride.
The whole affair, from the knowing dodginess of the acting to the crackers story, is a delight. You'll play through it in an afternoon (at least that is what number one son did) but there are missions aplenty once you've finished. You can find it here.