Which game have you finished the most times?

As sad as it probably sounds, mine's pokémon crystal

Deus Ex. It's been my game of the year for the past eleven years.

It would have to be Mega Man 2. I play through it every six months or so for funsies. I don't play longer games through more than once, but it only takes 30-40 minutes to get through Mega Man 2 so it ain't no thang.

I've completed Mass Effect 2 five times now, and I'm sure I'll complete it a few more times once I get it on PS3 tomorrow.   

Tons of NES, Genesis, and SNES games literally hundreds of times, considering that I''ve been playing some of these games constantly for over twenty years. Notables include the Mario games up to World, the Castlevanias, Ninja Gaiden Trilogy, DKC, Megamans 1-3, and many others.

I got the tuxedo twice in Metal Gear Solid. How many times is that?

Megaman X5 ps1, i can play it blind.

P3P. I'm not sure how many times, at least four though.

I played Mirror's Edge 30+ times 

Pokemon Yellow: 10 times or more

Resident Evil 4, more times than I can count. My brother and I played through Pro using only a knife. We were pretty obsessed with that game...

Probably Sonic The Hedgehog 2, several dozen times. I've gone through SMB 1, 2, 3, and World quite a bit as well.

probly like pokemon silver 
 
or halo 1 or 2

Hands down Contra: Hard Corps for the Sega Genesis. It's pretty short, but I must have played through it at least 15 times.

Super Castlevania IV.  I used to complete it every Tuesday with my friend just sitting there while we talked about junk.

I have 4 300+ hour saves on Oblivion.

I think I beat Super Mario Bros. everyday for about 6 months when I was 7. Somedays I probably played it 3-4 times. 

i noticed recently that i rarely ever finish the same game twice anymore. when i was younger id finish games several times (probably due to not having money to buy my own games so i had to play what i had). anyway, sonic 2! about 11 times! the music man >< the music!

halo 3 , uncountable

Crysis on very high settings, I think I finished it over 30X. I'm sure I did, since I like taking alot of screenshots for that game. It's also very fun. The next game, i'm sure I finished mass effect more than 10X.

Ocarina of Time I played that game so many times and had fun every time.

Probably Kingdom Hearts actually.

"I finished the first Metal Gear Solid twice. I usually never a play a game more than once. "

Guild Wars, have 4 characters that have beaten all campaigns including Eye of the North.

Metal Gear Solid, I couldn't tell you how many times I've beaten it, I've lost count.

The first Metal Gear solid, I must of finished it about 8 times. Ninja suit, yo.

Metal Gear Solid. I've beaten it 10+ times easily. 
 
Edit: Resident Evil 5 is 2nd, with over 50 hours logged and counting! I fucking love that game. So much co-op!

Mass Effect 1 twice. I think that's the max for me

Mega Man 5 for the Game Boy (The one with the bosses named after planets, the best Mega Man game) or Mass Effect

Depending on how you're counting it Super Smash Bros. Melee might be the game I've completed the most. If that doesn't count then I have a feeling it may be Meteos.

I play through Streets of Rage 2 and the first 4 Metal Slug games multiple times a year. 

" Portal- I've finished it 3 times^^ "

MGS3, hands down. I've done 5-6 plays of that, easily.

Probably between Twilight Princess and resident Evil 4. I beat each over a dozen of times. 

LoZ: OoT with Super Mario Bros.3 close behind!

This is a great thread with an interesting variety of answers.  The Mass Effect series is getting an awful lot of love and I'm interested in seeing Mirror's Edge mentioned 3 times which makes me really want to go back and replay that.  I never finished my second playthrough.
 
I don't replay games much and I have too many now to justify doing so.  I think the most I've played a game is 3 times which goes to at least Plants v Zombies.  I think I almost completed Darwinia 3 times and I can't remember if I played HL2:Ep2 2 or 3 times.  I've played through HL2 and Portal twice and recently Eufloria twice (mostly played while listening to cricket this winter).

Star Fox 64

" I played Mirror's Edge 30+ times  "

I played through Mass Effect 10+ times.  
 
I'm sure I finished Sonic 2 more times than that though. 

I've played both Indiana Jones' graphic adventures more than 6 times. Now I'm playing again FATE OF ATLANTIS on SCUMMVM :) 
 
By the way, I always replay a lot all the Bioware games  because of seeing all the endings :)

Earthbound is my winner. For a reasonably long RPG, I have beaten that game at least 5 times. Love it. 
 
A lot of my games from my childhood were never beaten or finished, so I didn't fly through much. Maybe the Mario game on Game Boy. Earthbound is the only one that I will totally play today, and it is why my SNES is hooked up in my bedroom while my PS2 and other similar systems are not hooked up at all.

I know it's The Force Unleashed. Not sure how many times though. 20? 30? 
 
Either that or it's maybe Marvel Ultimate Alliance, which I've beaten probably 15-20 times as well. 
 
That's probably it. Most time spent would probably be in LeafGreen. I logged I think over 200 hours on one cartridge, then another 100 hours on another, and didn't beat the game on either. 
 
That's...that's it as far as I know. I haven't even beaten as many games as I have digits, so...

The Darkness and The Orange Box...12 times for darkness 4 for half life

probably the original uncharted cause it was an easy game even on the hardest difficulty

Half Life 2, at least once a year since it came out.