X-Ball - The Rules
X-Ball (also known as Same Gnome) is a single player puzzle game where the purpose is to discover the right sequence of moves in order to reach a final state with as few as possible remaining balls. A move consists in removing a group of neighbor balls with the same color (click a ball from the group to remove the entire group; the pieces from above and right will come down and left in order to replace the empty space created by the removal).
You can rate your skill at this game by observing the usual number of balls that remain in the final state of the game. 5 or more means beginner; 3 - 4 means average; 0, 1 or 2 stands for advanced. Good luck!