This is free, I don't think it was a paid for application yesterday, it's just free and a tad addictive :)
Tune Runner is a bit different - which we need more of - basically you have to keep a little character running by drawing the objects that are coming to knock him over. For example a 'Z' is hurtling towards him, you draw a Z on the screen and it doesn't hurt and weaken him.
You also can choose a song from your collection and try and beat others who played Tune Runner while listening to the same track.
It's way better to play than even that wonderful description - give it a go!