1. Tap a ball to select it.
2. Tap an empty cell to move selected ball there.
3. When you form a line (horizontal, vertical or diagonal) of 5 or more balls of the same color those balls will disappear and you will get some points.
4. The goal is to get the highest score before all the field will be filled with balls.
Please report any issues in the comments section. Ideas and suggestions would also be appreciated :)