Here is a simple one-button mouse game that is easy to understand, and yet difficult to do. In fact, it's likely that it will be downright frustrating for those without the sharpest of reflexes or mousing precision.
ClickRed is an action game in which you must click on the moving red rectangle within each level. That is it. There is nothing more to it than that.
Oh, one more thing. If you do not ClickRed, you go back a level. Try to make it through all 10 levels in the shortest time possible.
Analysis: An elegantly simple casual game that anyone with a mouse can play. Very nice. ClickRed.
Another game by Games for the Brain creator, Philipp Lenssen. Thanks for the link, Kim! =)