My would have to be Bloodborne for Playstation 4. Not only my favorite, but it was a sleeper title for me. I actually did not play it until about a year and a half after it's release. Never knew about the game, but when it was on sale for $9.99, did a quick google search to see the reviews of the game, and low and behold, one of the best, if not the greatest games I've ever played.