For the elaboration for why something was nominated and subsequently chosen, watch the videos (YouTube):
Best Xbox One Exclusive:
Forza Motorsport 6
Halo 5: Guardians
Rise of the Tomb Raider
Best Wii U Exclusive:
Star Fox Zero
Yoshi's Woolly World
Super Mario Maker
Best PlayStation Exclusive:
Horizon: Zero Dawn
The Last Guardian
Uncharted 4: A Thief's End
Best Multiplatform Game:
For Honor
Dark Souls III
Fallout 4
Street Fighter V
Best Debut:
Final Fantasy 7 Remake
Horizon: Zero Dawn
Shenmue 3
Best Trailer:
Final Fantasy 7 Remake
Horizon: Zero Dawn
Metal Gear Solid V: The Phantom Pain
Missing in Action:
Not Ben Moore
Game of the Show:
Dark Souls III
Fallout 4
For Honor
Halo 5: Guardians
Horizon: Zero Dawn
Uncharted 4: A Thief's End
Best Xbox One Exclusive:
Forza Motorsport 6
Halo 5: Guardians
Rise of the Tomb Raider
Best Wii U Exclusive:
Star Fox Zero
Yoshi's Woolly World
Super Mario Maker
Best PlayStation Exclusive:
Horizon: Zero Dawn
The Last Guardian
Uncharted 4: A Thief's End
Best Multiplatform Game:
For Honor
Dark Souls III
Fallout 4
Street Fighter V
Best Debut:
Final Fantasy 7 Remake
Horizon: Zero Dawn
Shenmue 3
Best Trailer:
Final Fantasy 7 Remake
Horizon: Zero Dawn
Metal Gear Solid V: The Phantom Pain
Missing in Action:
Not Ben Moore
Game of the Show:
Dark Souls III
Fallout 4
For Honor
Halo 5: Guardians
Horizon: Zero Dawn
Uncharted 4: A Thief's End