Balance is a very simple game that manages to be surprisingly engaging.
All you have to do is just balance the stick on your virtual finger. I call it a "stick" for lack of a better name, but it seems to be a rudimentary 2D representation of a rotating plate, or a platform with a weight on it. You use your mouse to move your hand and you just have to keep moving it in the right direction so the stick doesn't lose its balance.
There are no real levels in this game - by that I mean that you never get to rest when a level is over and then start again all fresh and alert. When you manage to balance the stick for around 10 seconds (I tried counting, there's no indicator I could see), you simply level up. Every time you level up, the stick gets a tad shorter, and your task gets a bit harder. It seems like a really simple game at first, but when the stick gets really short, it starts to get pretty challenging. I managed to get up to level 10, so I'm not sure what happens when the stick runs out. Maybe you win, or maybe you just get a new stick, far superior to the one you started out with (tell me in the comments).
Another thing I liked about this game is the fact you can easily play it with your trackpad. Up until recently I was using the trackpad on my laptop exclusively, and it's nice to have a game that doesn't give an advantage to people who have a real mouse. It was even a bit easier with the trackpad!
All in all, a lovely way to distract yourself for a few minutes. You can fantasize about being a juggler in the circus while you play (not that I did, of course).