650+ games, please check the list linked in this post
Anything I don't already have on GOG or Steam. I generally swap games 1:1 unless it's a game that has never been bundled or hugely discounted.
I was away for about half a year, so if you have games that were bundled from Oct 2014 to Apr 2015 (inclusively), then there's a good chance that you have stuff that's of interest for me. :)