Warhammer: End Times - Vermintide. Has bugs and glitches, RNG saturated, and special enemies spawn a lot but this game brings back the Left 4 Dead memories.

1 SOMA
2 Pillars of Eternity
3 Witcher 3
4 Warhammer: End Times – Vermintide
5 Update STAR WARS Knights of the Old Republic II - The Sith Lords

Ori and the Blind Forest, Mad Max, Borderlands 2. Quite a few runner ups.

1. The Witcher 3 - by far
2. Dying Light - Took me almost a year to complete it but boy its sweet
3. Tales from the Borderlands - caught me by surprise. Really funny at times.
4. Party Hard - simple but fun

Witcher 3 is my ultimate winner, but a VERY VERY VERY closely followed by Life is Strange and Soma, both of which were let down by one or two issues towards the end... I also loved Dying Light for being surprisingly fun.

WItcher 3, Rocket League and Life is Strange all win in completely different categories.

Witcher 3. Haven't finished it yet but I love it a lot:-)
Runner ups... Wolfenstein: Old Blood, The Book of Unwritten Tales 2 and Cities: Skylines

So far, SOMA.

Well...i didn't had money to buy all AAA games this year so I'll say GTA V (PC Version) is GOTY 2015 for me.

I didn't play that many games of 2015, but I played and still play Witcher 3 so it's definitely up there.

LEMMA and WITCHER 3 for sure.

I am a PC player and GTA V is my personal game of the year.

Mine is easily Sunless Sea.

According to Steam it's now my most played game ever at about 70 hours (and I don't get much time for gaming) and I can see myself sinking at least that much time into it again.

Fantastic story, eerie environment and so many rage quits. I love it!

Witcher 3

The Witcher 3
Life is Strange
GTA V

I haven't played Undertale yet but I plan to do it soon. I've enjoyed Batman Arkham Knight a lot but unfortunately the problems at release and the way WB handled the situation prevent it from being a GOTY contender imo

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad

GTA V and Mad Max

Dirt Rally

Broforce, with Nuclear Throne a close second.

Life is Strange and Tales From the Borderlands.

Also, I only played it this year, don't know when it was released by Hyperdimension Neptunia!

I'm working on my personal top 10 of the year, order might change but the games will probably be:

Arkham City
South Park
crypt of the necrodancer
Scrolls
Spelunky
Red Dead Redemption
Metal Gear Rising
Bastion
prison architect
Mass effect

The Witcher 3: Wild Hunt & Grand Theft Auto V!

Mad Max