This award goes to the game that I had the most fun playing while going for 100% completion. It isn't necessarily a challenging 100%, or even a long 100%. These are the games where I never had to take myself away from just enjoying the game to grind out a bunch of achievements after the fun part was over because, let's face it, if you want to "complete" a game most of the time you are going to have to endure some gameplay you'd normally avoid.