Monkey See, Monkey Do
Other than Skyrim, this is the game I've been dumping the most hours into.
I'm over 2200 puzzles deep, now. I will watch this game die.
Monkey Wrench is far from the most interesting game I've played, or the most technically impressive, or the most inexplicably immersive. But it delivers more on the "play anytime, anywhere" mobile-gaming goal than any other I've tried.
A couple months back, Blue Ox released new puzzle packs covering their previous "daily" puzzles; so I was able to do the ones that came out before I started playing, up through June. Hopefully, after the new year, they'll release a July through December pack and then I will have played every puzzle, because this is important to me, for some ungodly reason.