[Affray]

Zelda: Ocarina of Time

That's probably my wife's favourite game.
I never bothered with the N64 so I missed out on this one.

I could never narrow it down to one game because there are so many factors in play.

Top three though?
Red Dead Redemption
Morrowind
Dark Cloud 2

[Fozy]

Definitively has to be CS:GO, I've spent so many hours on the game.

[Dr Zoidberg]

Cabal.

The very first MMO I ever played. Played on the original server for like 4 years then started playing on private servers, even became a GM on one of them.
Would still play it to this day if I had time.

Last year I fall in love with SkyForge but I didn't have that much time to play it.

[Blue]

Garry's Mod. When I first played this game I fell in LOVE with it. My original steam account had 1,000 hours, and another one had around 950 (I always end up selling my steam accounts). My current one has 2600 hours on it. I've put SO much time into that game, it's truly a fun game with tons of options.