If you are looking for a relaxed puzzle game Simple Motions is the game for you. The goal is to make the red ball collect all of the stars on each level then reach the red flag. What makes it interesting is the way you control the ball. Instead of controlling it directly you do so by placing "tokens" on the screen which tell the ball how to behave. This is one of those free games you can just pick up and play when you aren't in the mood for anything more intense.