Using
The main rules of game is as simple as possible: you move (using mouse) marbles from cell to cell and build lines (horizontal, vertical or diagonal). When a line contains 5 or more marbels - they are removed from the field and your score grows. After each of your turns computer drops three more marbles onto the field.
The increase in score dependeds on the amount of erased marbles and if shows the next balls. The increase will be smaller if you use the information of what's next.

More features
is wonderful in that it will allow you to kill 5 minutes while you wait for that program to compile.
Or, if nothing else, it will allow you to kill 5 minutes.