Cleared the first "world" in Bad Piggies. 3 stars on all dem contraptions!
Warface - Last i checked the XP multiplier still hadn't been activated for Co-op but was on in Versus.
Zoo Tycoon Friends - Started plugging away in this grindfest.
Focus on Warface man - ZTF will be there when that's closed, and you're looking at 2 months grind overall. Although, you really only need to check in ~4 times per day for the concessions, you can accelerate things quicker by checking in every 45 minutes to collect from the animals. If you wait and they get hungry, their contribution winds down to 1 coin.