Looking for something to do this weekend? If your'e a PC gamer, you have options. For one, Steam's Summer Sale is underway, which means adding more games to your library than you'll possibly have time to play. If you'd rather not spend a dime but still want something new to play with, good news -- Titanfall on PC is free to play for the entire weekend! We're not talking about a teaser demo, mind you, but the full game.