What is the game that changed your life? why?

would have to be bad rats.

Walking dead

Edit: Actually... Probably GTA VC when it first came out XD

TF2, because it pretty much introduced me to the world of online gaming and Steam, rather than playing only single-player games that I got off the internet.

I guess Guitar Hero 3? I got interested in learning guitar after playing it, and when my friend asked me to play guitar with her in the talent show (this was 7th grade), I took the opportunity.

Guitar got me interested in music, and I ended up joining the high school's marching band to deepen my musical knowledge (it was a toss-up between band and orchestra. i chose band because my friend remarked that I could join jazz band and play guitar if i took band. that was a total lie, as I later found out I could join jazz band as long as I took either of the two). I ended up in the drumline and dove deep into a world of rudimental drumming and awesome, awesome, awesome indoor percussion shows (look! Muse! The Colosseum! School!).

Last year, my junior year, when drumming season and AP testing (FYI: AP classes are a type of accelerated class in high school accompanied by a nationwide test. Scoring well on on these tests might grant you college credit at some institutions) were over, I brought my guitar to play in calculus class because we weren't learning anything. One day, a fellow classmate came up to me and asked me to play her a song.

The interesting thing is, that's how I got to know my girlfriend.

I think any MMO you play long enough changes your life. I played City of Heroes and eventually found a fantastic community of people to talk about games with.

cs go helped me a lot

Arma 3, it helped me to train my English skills and be more confident when talking in English.

Bad Rats

It's shittiness has ruined me. I no longer smile now.

Terraria. In so many different ways. I met a cool community of people. Terraria got me into gaming, and indirectly made me amazing at grammar. (I met a guy on a server that is a god in my eyes. We talk often.) Most I have ever put in a game, and I love it.

World of warcraft.. i had 0 friends before i started playing - sat at home all day and only watched tv

now i have a group of good friends (irl) that i have known for 8 years

Monkey Island.

I met one of my best friends in university (and beyond) when she introduced me to this.
I had originally been picking up some extra meal plan stuff and the "quiet girl" asked me into her dorm room to do the transaction.
( She lived on my floor in residence and I had seen her around but not a lot - washing her dishes in the bathroom sink and waiting for the elevator)
She asked "want to see something neat?"
I said yes and she turned her monitor around and she showed me "the head of the navigator"
Wow.
Two months later I bought my first PC that summer (I had been using a C64) along with this game.
When I returned to residence and school next September we would pull all-nighters playing Sam and Max and Gabriel Knight together.
We both were seeing other people and things never went beyond friendship (which honestly was a good thing.) and we are still amazing friends over 15 years later.

Thanks Julie.