Why would you want to hack growtopia anyway? Growtopia would be ruined for us all and allot of us enjoy this game allot. Over 3000 people play the game, and over 3000 people would be mad. They would be mad at you!
This game is (like somebody said) very hard to hack. You have about 10% chance on hacking (out of 1000 that is )
Anyway, you better cross your fingers that Seth or Hamumu don't find you and this post. Because they could ban you from forums and/or the game.
Just because you are doing this for a friend is not going to make you safe. Why would you even ask? No body is actually going to say "Oh, simple question. You just go to something something website and press something something button, write in your password and the game you wanna hack and voila you hacked Growtopia" and just pretend it's over with. How do we know you're not lying? How come you only said your doing it for a friend AFTER you got all the negative replies?
Just because your friend asked (or you) it does not make you safe. Somebody who knows the rules of the game and of forums would have said "No I am not asking that! The game is very safe and asking that is just going to get me banned. I reccomend you stop asking, and just forget the subject"