In some cases it isn't until I've beaten every difficulty, unlocked every extra feature and beaten the game into a bloody mess and made it my bitch...for others I just move on after the campaign and a try at the shambolic online. Examples; HOMEFRONT, traded it back so quickly I got my full price back. Beat the campaign and had a 'go' at the online, so to speak. Now on the polor opposite side of the spectrum we have Demon's Souls, inFamous, Uncharted 2 & Battlefield Bad Company 2. Aside from Demon's Souls, which I keep for sentimental value to be honest, I didn't even think about giving up the game until I had platinum. (Asian import)

When I used to get few games I would do everything possible except the hardest difficulties.Now I get a lot more games I usually beat the story then stop playing.

I'm the type that plays a game over and over, but often will do it in smaller segments.

I keep my games, having saved almost 95%+ of all games purchased. I go back to them, even the ones years old, and am amazed at how I still enjoy them, for what they are, FUN.

I'll go over a game to try and beat a game level, or improve a score, a time, or simply - odd s it sounds, to explore another area of the gameworld.

I'm amazed by the number of great new things I've found in various games. The stuff the development team have hidden inside the game that you only find when digging deeper, looking in areas off the linear path most gamers follow blindly.

Ace COmbat had so much DLC with new aircraft, missions, as did Forza series. SO I get the new cars/planes etc, and try my hand at seeing how I can get through the game with that car/plane etc. Using it only through the different levels and increasing its performance.

Or go through Medl Of Honors's Tier One over and over again, trying to get through a level without getting killed, and under par.

But - most gamers these days do NOT do that. They play a game for a minimum period, trade it back before the clear wrapping has stopped unfolding in the dustbin, trying to 'beat' a game in the lowest time period, without even 'enjoying' the game that a development team has put over 3-5 yrs of their life's work into.

I still have over 85+ 1st-gen Xbox games, and now own over 100+ X360 games, but have I 'finished' them all - no, doubt I ever will. But that doesn't mean I'm not having fun, and enjoying myself just playing them.

I always beat the campaign, then go back to get all the trophies I can (try to get at least 50% for every game I play). Then I play multiplayer and stick with that for as long as it is interesting to me, or until I buy a new game...

When I beat the game I'm done. Some games I play over and over like Half-Life and Oblivion and those I do a lot more in.

Otherwise I don't fuss too much over getting 100%

I'll also quit if I realize I'm no longer having fun, that's another way to be done with a game *cough*FFXIII*oough*

Well it depends on the game, I play alot of rpgs and some inspire to go the distance and do a 100% run like Digital Devil Saga, some dont. One game I recently got that makes me want to get everything is Ar Tonelico Qoga, however I didn't feel especially concerned with 100%ing Yakuza 3 since that just has soooooooo much shit to do, same with Star Ocean The Last Hope. I guess I'll do it if it's fun and reasonable.

Beaten if I've seen the credits, completed if I've done everything and have it 100%'d. Usually, I'll only bother fully completing a game if I like it lots.

I consider a game finished when I've completed the single player/campaign section of the game regardless of trophies/difficulty level etc. It truely becomes finished with me when I get bored of ever playing it. I would make the comparison with Modern Warfare 2; because I still play it and enjoy my time spent on it, then I wouldn't consider myself finished with this game.

I used to be a completionist with games. Strive to 100% them, get ever ultimate item, every collectible, play through the hardest difficulty if it meant to unlock something. The last true game that I 100%'ed was Metal Gear Solid 4. Got all the emblems. Now with a job and school, I don't have the time for trying to get all achievements and such.

Now I just play through the story mode, maybe do some other features the game has to offer if my interest is kept steady, then move on to the next game. As much as I'd like to "finish" them completely, there's just simply enough time. So currently, it's completing the major portion of the game, usually the story, that counts as me finishing it.