It is scientifically proven that if you take a break from work every now and then and have a little fun, you work better. If you spend a lot of time in front of the PC, you need a program like Briblo Screensaver, which interactively fills your screen with coloured blocks that fall from the top.
Briblo Screensaver is a variation on the famous Lego blocks with a touch of Tetris, two simple but addictive and well-known games. With only six pieces of 2x4 Lego you can make a million combinations. To do it use the arrow keys, the taskbar and the Enter key.
Have fun with this free screensaver and fill in those dead times.