The rules of DROPBALL

1. Don't let the hole fill up with balls! The game ends,
   if all the columns are filled up, and the machine
   can't drop in more balls on the top. 
2. You can eliminate the balls, if you collect 7 balls
   of the same colour vertical, horizontal or diagonal.
3. You can change the position of the balls by moving
   the rows or the columns.
4. To move a row use the the mouse, click on the arrows
   on the right or the left side. A row can be moved
   only if all the balls in the row are standing.
5. To move a column click on an arrow on  the bottom. 
   The ball falling off on the bottom will be dropped in
   on the top. A column can't be moved, if it is filled
   up. 
7. 7 balls of the same colour (but not green) in a row,
   column or diagonal disappear. If you collect less 
   than 7 balls of the same colours, they can change 
   their colour:
	3 green  transform into blue
	4 blue   transform into yellow
        5 yellow transform into red
        6 red    transform into brown
   (You can't 7 green, try it, if you don't believe it!)
8. Collecting brick-balls can be bad or good.
9. Collect 5 brick-balls to get 10000 bonus points and
   to slow down a bit the falling in balls. It is not
   easy, because you can collect 3 brick-balls meanwhile,
   and that is bad!
10.If you collect 4 brick-balls, you will get the 
   'slip mode' for 30 seconds. In this mode you can't 
   bild alone standing high columns, because the balls
   slip down, if they don't have 3 neighbours under them.
   Dont't collect 4 brick-balls in 'slip mode', else you
   will get the 'dropball' punishment (see later).
11.If you collect 3 brick-balls, you will get the
   'diagonal mode'. In this mode the balls will transform
   or disappear only if they are arranged diagonal. The
   'diagonal mode' will end, when you collect 7 balls of
   the same colour (of course diagonal!).
   Don't collect 3 brick-balls in 'diagonal mode' 
   (possible of course only diagonal), else you get the 
   'dropball' punishment (see later).
12.The dropball punishment:
   On the top will be dropped in 7 balls (or less, if 
   column(s) are already filled up). OOOPS!!
13.Collecting bonus:
   If you collect 7 balls of the same colour, you have 15
   seconds to collect 7 again. You make it, you have 1000
   points and 15 seconds again. Then you get 4000 
   points...then 9000 points...then 16000 points...etc.
14.Don't give up!! I have more than 2 000 000 points!!