This is an addictive game for iPhone.
The goal, get the ball in the hole. But...the ball comes in from the side of the screen, it isn't aimed at the hole, and it won't stop. You have to draw lines (or "walls") to make it ricochet into the hole. You get a limited number of available walls on every level...and on some levels, there is a level up the ball needs to hit before going into the hole.
When you're bored at work, give it a try.
Free for iOS devices.