Color Lines for iPad app for iPhone and iPad

The object of "Color Lines" game is to connect 5 or more balls of the same color to a horizontal, vertical or diagonal line.
First tap on a ball and then on its new destination.
The game starts with a 9×9 board with three balls chosen out of seven different colours. The player can move one ball per turn, and the player may only move a ball to a particular place if there is a path (linked set of vertical and horizontal empty cells) between the current position of the ball and the desired destination. The goal is to remove balls by forming lines (horizontal, vertical or diagonal) of at least five balls of the same colour. If the player does form such lines of at least five balls of the same colour, the balls in those lines disappear, and he gains one turn, i.e. he can move another ball. If not, three new balls are added, and the game continues until the board is full.
If the balls removed a time are more than five, the points will be doubled, i.e. 1 point for 5 balls, 2 points for 6 balls, 4 points fro 7 balls, ... and so on.
If you gain the turns continually, the points also will be doubled.
There will be frozen balls appear after several turns, these balls are unmovable. If you remove a line with frozen balls, the points also can be doubled.
You can undo last move when you make a wrong tap occasionally. But you can only undo one step.