1) FIFA 18(PS4, X1, PC, NSW, PS3, X360) > 1.5M(as of December 2017)
2) COD:WWII(PS4) > 500K(as of November 2017)
COD:WWII(X1) > 100K(as of November 2017)
3) GTAV(PS4, X1, PC, PS3, X360)
4) The Legend of Zelda: Breath of the Wild(NSW) > 200K(as of August 2017)
The Legend of Zelda: Breath of the Wild(Wii U) > 100K(as of December 2017)
5) Mario Kart 8 Deluxe(NSW) > 200K(as of September 2017)
6) Assassin's Creed Origins(PS4) > 200K(as of November 2017)
7) Super Mario Odyssey(NSW) > 200K(as of November 2017)
8) Horizon Zero Dawn(PS4) > 200K(as of March 2017)
9) Tom Clancy's Ghost Recon Wildlands(PS4) > 200K(as of June 2017)
10) Resident Evil 7 Biohazard(PS4) > 200K(as of September 2017)
https://www.resetera.com/threads/germany-top-20-2017.17032/
Numbers shown in this list are the "MINIMUM" of each game. So it could be well over that
