Regularly 29.99. Must login to free Ubisoft account, or into uPlay client, to add to your library. Must play using uPlay client.
Game info at Steam http://store.steampowered.com/app/243470/Watch_Dogs/
From GamingPH: Ubisoft is giving away a copy of one of their greatest AAA games for everyone. The game Watch_Dogs is now FREE in uplay and you have a chance to own it, you can redeem this game from their website or by just logging in to the uPlay client. What you only need to do is sign in and add the game to your library, this offer will run until November 13, 2017 – after that it will be back to its original price. To clarify, once the game is added to your library – the game will be completely keep in your account forever.