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Game goal is to arrange balls of the same colour in a straight lines (every direction). 5 or more balls on a straight line are removed and points are given. Longer lines give more points to you.
Lines are classified on the basis of their alignment. The lines which are drawn horizontally are called horizontal lines. The lines which are drawn vertically are called vertical lines.
You can observe lines all around you: from the ruler in your pencil box to train tracks, from the buildings in the city to the walls in your home. Lines are a rich and fascinating concept in mathematics, and there is a lot to learn about them.