Here's a really fun game where you move the blocks around to open the path to slide the blue bar through the opening.  I don't know how many levels there are in this challenge, so just be careful in the event that there are enough to stretch your morning coffee break right through lunch and up to the time your boss calls you into the office to suggest its time you put your resume on and find a job as a professional game player.

Here's how to play:

Drag the blocks to move them left or right or up or down,
depending upon their orientation.
The object is to move the blueblock out through the opening on the right.
When you complete a level, level up and down buttons appear
appropriately under the level indicator.
All your progress is automatically saved.