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Note: You need to do this on the client, not the website.
I'm not sure if this is a glitch, demo or mistake but Ubisoft has listed Trials Fusion under free-to-play. All you have to do is go onto the Uplay client, click the free games tab and click Add to my games next to trials fusion. It will be added to your library and you can download the full game.
I'm not sure how long this will last, or if they'll remove it from your account, but hey, a free game is free :)
I already bought this game on steam, so I created a new Uplay account, did what I said above and it was added to my account. The download size is the same as steams.
That's a mad find. Been wanting this game but didn't want to fork out $20 for something I might get bored of after 5mins. I think they might take it down when they see their error but not sure if they can remove the game for people who already got it. At a 5GB download I'd say this is the full game.