So I was unwinding, playing a game of Plants vs. Zombies, when I thought to myself how "mindless" it was. This isn't to say that it's not fun, but that it is fun to play, without requiring too much thought or requiring one to exert much "effort". Plants vs. Zombies is a personal favorite, as well as Faerie Solitaire (although, funnily enough, I don't find regular Solitaire to be that entertaining).
So the question I pose is this: what game(s) do you play when you just want to "zone out"?