Can I enter a bundle giveaway if I already have a game from it?

Gifter decides.

Personally I think its ok if you have less then half the games in the bundle if its like a HumbleBundle.

If you have a game from a bundle, there's no big deal. If the bundle has 6 games for example and you have 1 or 2, all will be fine. If you are worried about it, then ask support. Hope this helps.

Alright, thanks guys :)