On August 26, 2010, Zynga launched Zynga Lotto. You get a lottery ticket with 9 squares. You get to scratch off 3 of the 9 squares only, for a chance to uncover a winning logo. You can ask friends for tickets (up to 20 a day). Each day you get a free bonus ticket by Zlotto. Zlotto ends October 10, 2010.
The very first attempt (right after register) is very likely to have you win the prize. Upon the first scratch your odds are 1:9, on the second 1:8 and 1:7 on the third.
However seems like zynga algorithm generates a different random prize square every time you do a new scratch. So the win square can actually "move" 3 times.
NB: You can only claim one prize from each game in each set There are 4 Sets of prizes:
If you were able to take advantage of a glitch or code-trading to earn multiple of a prize, Zynga will reset your quantity to one