not really, as I'm not really to good on "ratio farming" - I am in 2 groups that use any kind of ratio at all,and still it's among other rules, neither is only ratio based. And if "ratio groups" were to be a big part of this "puzzle" I would probably bahave the same no matter what group to "optimize" wins, which is not really the case ;p Because in one group, which focuses mostly on bunbdle games, and is like bundle-leftovers group my ratio usually suck, I'm constantly on verge of minimum ratio, because most of the times I cannot be bothered to buy loads of cheap bundles to dump few dozens of bundle games to fix it, so I mainly only dumpl leftovers there, on the other hand in other group which uses ratio I gave away almost twice as many games as I won, so I could just sit and leech and still I created 9 GAs for it recently despite not having to do so to fix my ratio ;p Also there's been times on SG where I was in more retio groups as well as times when I was not in a single ratio group and my gifting behavior wasn't really changing because of that.

If I were to say what is the biggest part of this like you called it "puzzle" I would say events - both closed and open ones. If I were participating in SimGiv for example I would always put on something great - something I would not justify buying for myself (like mentioned Witcher 3 preorder), but hey, SimGiv is not a ratio group ;p there's been people who created 2-3 GAs and won 100+, there's been people who created 200+ GAs and won 3 ;p. Also in times when I was making puzzles I would store up best prizes for big puzzle event - because if I spent 100h+ making bigass group puzzle that people were solving not only for days but even for weeks it would end up quite dissapointing - both for me and for solvers - if end-rewards for people who solved it all were just bunch of bundle games from current Humble Tier 1.