League of legends on pc a shit load of hours
Dark souls 2 on pc about 80 hours
The witcher 3 on pc 49 hours.

the witcher 3. it doesnt tell me how much time i put in on PS4. but i spent shit loads of hours in it.

Splatoon with I believe 118 hours and 45 minutes and counting. :)

Easely Splatoon, followed by Hearts of Irom III and Xenonauts. Since both are direct downloads (no Steam or any other shop which tracks playtime), I can't tell you exactly how long I played, though

Right now I'm around 210 hours in Splatoon. Won't stop anytime soon, either. 

Second is Super Mario Maker at 93 hours, and third is Super Smash Bros. for Wii U around 77 hours.

Company of heroes on PC don't know how many hours but damn that game is fun online.

Next is probably GTA5 on ps4 at about 20 hours.

* Xenoblade Chronicles 3D - 3DS - 180 hours.
* Devil Survivor 2: Record Breaker - 3DS - around 140 hours.
* Nobunaga's Ambition: Sphere of Influence - PC/Steam - 105 hours and still playing it on regular basis. At the end of year, I think this game can be my most played this year....
* Cities: Skylines - PC/Steam - 47 hours
* Tales of Zestiria - PC/Steam - 33 hours and only halfway through the story....

That's five of my most played games this year. There is a big possibility it can be changed at the end of the year..... Want to continue Phantom Pain, but I am scared that I'll miss something big by not buying and playing Ground Zeroes first.

Metal gear V

Then probably Witcher 3 - though this was mainly due to Gwent card collection

I see Fallout 4 possibly eclipsing the few hundred hours I put into MGSV

I think that it's either Mount & Blade: Warband or FIFA 16, been a pretty slow gaming year. I also have 80-90 hours in The Witcher 3 but I have almost 200 in M&B and FIFA 16.

1st : Pokemon ORAS with 120 hours
2nd : AC III with 80 hours
3rd : MK8 with 60 hours
4th : Hyrule Warriors with 49 hours
5th : Pokemon Y with 30 hours