You can pick up Watch Dogs for free today thanks to Ubisoft extending their recent form of giving away free games.
All you need to do to pick up the game is log into Uplay, and claim it here. This will give you access to the game forever, so no free-trial nonsense. Claim it, download it, play it. This is added to the current Happy Playdays promotion of free games, which sees you being able to pick up Assassin's Creed IV: Black Flag and World of Conflict for free, too. This current offer for all the games ends December 23th at 5 a.m. ET, so get moving.
The first Watch Dogs was a bit of a divisive game, but it is also one of the biggest selling new IPs in years. It's a big, long sprawling Ubisoft title, so it is definitely something that will keep you busy if you've never played it. It's all yours, too. Have at it.