Barring FTL/Binding of Isaac/mobile games, because those aren't for dedicated game time, I tend to stick to whatever game I'm infatuated with at the time. However, Armored Core for Answer sporadically takes my attention. I have recently completed my 13th SS-Rank of it, meaning 100% completion, and I try to do things differently every time.
Anecdote time: Once I had my little cousin to mind for the morning, and he wanted to play the PS3, so I took out Dark Souls and asked which game he'd like to play. He chose ACfA, to my surprise, so I set him up with a new file and a tank that hardly had to move and just told him to fire when he locked on. But the funny part is he asked me whether I'd beaten it, and I said "I've SS-ranked it 10 times". To which he replied "Well...my brother has beaten it...11 times." And instead of rolling with it like a good cousin I told him flatly then and there that his brother did not even own this game and even if he did, there is absolutely no chance he had played it more than I have. It was bad enough being shown up at rollerblading, I wasn't going to lose in Armored Core fanaticism. =_=