This is a highly addictive puzzle. To learn more about the puzzle, install the Widget, right-click on it and select "Help...".

The board has 15 slots. The game starts with 14 slots filled with a marble in each and 1 slot empty. The objective of the game is to remove the marbles from the board one at a time and end with only one marble left on the board. Most of the time you will end up with more that one on the board!

Trust me, it is possible to end with just one. ;-)