https://www.polygon.com/pc/2018/12/15/18142147/assassins-creed-odyssey-free-pc-google-project-stream

If you sign up for and participate in Project Stream — Google’s foray into a streaming video game service, which launched a test back in October — you can get a free copy of Assassin’s Creed Odyssey to keep, on PC.

Ubisoft is dangling the freebie, and some free Helix Credits (the series’ in-game currency) to get folks to participate. Project Stream is currently only compatible with Assassin’s Creed Odyssey, which testers can already fool around with at will just by launching the service. But if they spend at least an hour playing Odyssey in Project Stream before Jan. 15, 2019, they get a free copy on PC, linked to their Uplay account. (Uplay and Google accounts are necessary to participate.)