I remember playing this game a few years ago, but didnt remember the Sisyphus part and thought it was Silophysus or something and wasnt able to find it until I stumbled into it a few days ago. HURRAY!
http://gamer.raduga.ru/sisy/index.shtml
Pretty simple game. push rocks into the snakes, and then there are those circles, push those circles into the holes.

Very addictive. Didn't get it at first, but it's fun when you pick up on it.