Probably game called the way out because i had a good friend to play it with. We had a blast but it can be pretty much any game for me but i need to get the feel like im "present" in the game and when that happens time goes by so fast... Happened in the way out, i was on my friends house we had lan party and i think we started like 10am and we played like 10 hours and it felt like we just started :D
It's not often that I can say to myself that the game I'm currently playing is the most fun game I've ever played but I think the definitive answer would have to be Borderlands when I played it for the first time.
For me, its minecraft I used to have a friend that comes over to my home just to play multiplayer, until he moving house to a far away place, since then minecraft feels boring, also in newer versions, it gets more laggy, i guess my laptop can't handle it anymore. it was very fun, thank you minecraft.
Its all fun and games till the teacher gives a test containing materials you haven't studied before.