The final game given away as part of the Christmas campaign is a AAA title. 
Marvel’s Guardians of the Galaxy
Fire up Star-Lord’s jet boots for a wild ride across the cosmos in this third-person action-adventure game, a fresh take on Marvel’s Guardians of the Galaxy. With the unpredictable Guardians at your side, blast your way from one explosive situation to another, with original and iconic Marvel characters caught in a struggle for the fate of the universe. You got this. Probably.
https://store.epicgames.com/en-US/p/marvels-guardians-of-the-galaxy
Expires 16:00UTC, 11th January.
{Alternatively, it is also 75% off on Steam until just over an hour from the time of this post: https://store.steampowered.com/app/1088850/Marvels_Guardians_of_the_Galaxy/)
Enjoy! 