Speed Demons

It's a good casual choice that can be played one handed in portrait mode, with your thumb simply weaving your car through traffic. There are a wide variety of modes within this basic gameplay--you could be chasing someone, running away, or racing against a timer--but they all amount to either avoiding or hitting certain other cars. You also get different vehicles that handle somewhat differently, and a number of tracks with minor variations. As a casual game, it didn't grab me, but it might be worth checking out if an arcade racer appeals to you.