It seems like Steam is releasing a new Free-To-Play game if not every day, at least once a week. The selection has gone from few to many in the last two to three years. I have yet to check out every game in the free section because I'm already stuck on a few I haven't tired of. Occasionally you may even come across a unexpected treasure. Out of all of the Free-To-Play games, which is your favorite? Have you found any hidden gems?