Puzzle Game.
Very similar to Pipe Dream. You roll a ball along a path, set on a bed of tiles with one free space. You may slide the rows or individual tiles into the open space (like one of those little thumb puzzles). The ball rolls at a slow speed and the overall game is timed. You complete as many stages as possible in the set time. To help complete more stages you can speed up the ball with a button press. You also have a bank of "stop time" which dwindles away when you use it. Use the stop time to figure out difficult puzzles.
very addictive.