Hi,
can i give you a advice or please you that you make "free for all" GA's only at lvl 2+ ?.
It's nothing against the real, nice, friendly players on lvl 0 and 1 but on 0 + 1 are 90% autojoiners, bots and extreme leechers (3 years+ on sg, never given anything out or only 1 GA to be on lvl 1 -to access more with a higher rate- but taken hundreds of GA's).
So i think you feed the wrong people with your Giveaways.

It give many security measures you can use too. By a part you can avoid the lvl2+ and support all the new/low users without supporting the bots/autojoiners/leechers.
Examples: Forum thread, jigsaw puzzles, puzzles, itstoohard, sgtools, hidden text or links, edited links and so on....
When you have question i try to answer them.

Would be great if you think over that.
Thanks and have a nice week :o)