Most obsessive compulsive thing you've done in a game?

[MetalWingedWolf]

lol Um... selling 2.5 million to the mudcrab merchant of Morrowind on xbox. After of course learning about the Overflowing loot bag and collecting and dumping as much awesome stuff as friggin possible. While collecting candles... like a loon. Killing the odd NPC and claiming their homes while looking through my collections for enough gems and weapons and armor and books and potions/(ectoplasm on the bed sheets >.o) to make them look like awesome nerdy man caves worthy of my beasty bad man console playing argonian.
Oh, and stripping corpses semi nude and positioning them in sexy ways or blasting them with arrows and jerking them around by holding the shaft.
AND, constantly pretending to drown creatures I've killed near water. v.v... Torturing and interrogating... all that fun stuff ... .... ^^ No regrets.

PS. And JUMPING IN THE THIRD PERSON.
Because the two games that make me OCD, these two that I've mentioned, have taught me to doubt everything that could exist over my shoulders and behind my own eyes ... >.>....*Struggling to look inside myself...* >.<

 

[chaosyoshimage]

oh look, I fired one shot and now have only 149 bullets left... better reload! (that's about the time a guy comes at me and shoots me in the face while I cant fire)

I do this!

Well let's start with pokemon : i religiously caught ever natured ditto for when i wanted to breed a pokemon woth a specific nature ( because you cant breed ditto ) . Also i always get the male pokemon that i want to breen with a specific characteristic. Protip: when breesing more often that not pokemon keep the nature of the female pokemon and the characteristic (IV) of the male pokemon.

In POP 2008 , i got every glowing seed thinggy , not for the achievement , but just because the landscape was so beautiful i wanted to see everything.

Why don't I do that? I'm going to get a Ditto for every nature, but I'm never touching POP08 again, no matter how beautiful it is...

 

[Loreley]

I've looked at every single planet in Mass Effect 1 (and visited all that I could visit, of course, scanned the rest, read the text on the non-interactive ones). I had a little checklist to remind me which star systems I was done with. I do this every time I play, despite the fact that I know it's not mandatory and many of the side quests (pick up the asari writings etc.) don't have a big (or any) influence on ME2. My OCD will not be tricked by such petty things as sense!

Oh yeah, and another member of Team Obsessive Reload here.

 

[Hawk eye1466]

I forget the name of the game but over half of the achivements were secret so every level I tried to interact with every object and did everything I could possibly think of with them or any weapons I had. It tacked at least an hour and a half to every level.

 

[Jak LesStrange]

Finding and hitting EVERY object in Costume Quest with my bag to get candy and then buys a bunch of stuff with what I have collected. Rinse and repeat.

 

[RoyalSorceress]

Let's just say Yahtzee was right when he said that Epic Mickey exists to annoy people with OCD. (Why do I have to keep repainting everything?)

 

[Caffeine Rage]

I tend to sort things.

In Oblivion, I get houses with lots of shielf space so I can sort the potions I make and find. But, I also rarely use them because somewhere in the back of my mind, I'll need the more later. Of course, by the time that does come up, the potion is hardly worth the effect because I've leveled up so much.

Same goes for Fallout: New Vegas. Thankfully, the hideout that I use has a bunch of auto sorters in it. So, it isn't nearly as big of issue.

Even in Team Fortress 2, I keep my backpack very neat,Sorted by class then weapon slot. I also like keeping as full of set of weapons as I can. At this point, I'm only missing three and I can craft two of them if I really wished to do so. There is just something that says, when I go to craft or trade a weapon that I only have one of, that I will need it for some reason. It doesn't matter if the weapon is next to useless for how I play the class, if I play the class, I must have it!

 

[Dark Knifer]

I reload if I fire even one shot then look everywhere for ammunition to bring it back up to full ammo.

 

[maxmanrules]

Running through Crysis on the hardest difficulty and trying solely to use melee. Only melee.
On the upside I can do it blind now

 

[putowtin]

This:

collected every single feather in AC2 just to finish off my monterrigioni construction

and this:

Ive spent a lot of time on Mass Effect playing through both 1&2 about 4 times each, trying out all the classes and endings. Ill probably finish another 2 plays of each before number 3 comes out. Oh, Bioware, though art a heartless ***** for pushing that one back.

with a touch of this:

I've looked at every single planet in Mass Effect 1 (and visited all that I could visit, of course, scanned the rest, read the text on the non-interactive ones). I had a little checklist to remind me which star systems I was done with. I do this every time I play, despite the fact that I know it's not mandatory and many of the side quests (pick up the asari writings etc.) don't have a big (or any) influence on ME2. My OCD will not be tricked by such petty things as sense!

I'm hoping all this OCD will pay off in the long run!

 

[Manji187]

If I have done something obsessive compulsive, I've probably done it in Morrowind.

 

[Woeps]

Before my save got corrupted every tunnel that I dig/explore in terraria had to be connected to my base...

 

[dark-mortality]

I reload if I fire even one shot then look everywhere for ammunition to bring it back up to full ammo.

The bane of my existence in all games, but if I DON'T then it annoys me so much I can't focus...

OT: Err, yeah, Except from shooting games, I angst over games where I can move objects, have an inventory, or minecraft-ing. Everything have to be NEAT UND TIDY, and if possible, symmetrical... God I hate it when things look untidy -_-

 

[SSoSFAGTiaCaGwaP]

For a short period of time, I would play Animal Crossing every day. There were no weeds in my town ever, and if I missed a special event such as a flea market, I would pretty much emotionally break down.

And that children, is what Animal Crossing does to you.

 

[the.gill123]

Destroying half of the West wing of the Arklay Mansion I was building in Total Miner (from the Gamecube version of Resident Evil), just because the 3rd floor hallway was not quite to scale, took me another 5 hours.
I have given up on it now since I can't do circular object, and since the entire Residence basement is a giant circle, with a circular tank, and circular railings, it has become too much of an annoyance, though I did make a start on the lab, I built down to where Lisas mother is.

 

[No_Remainders]

I'm currently on my 3rd playthrough of Deus Ex: Human Revolution, and I'm playing on the hardest difficulty and trying to get the achievement of not killing anyone.

I WILL NOT RANDOMLY THROW FRIDGES THIS TIME!

 

[Mike Laserbeam]

I search literally every inch of every room I ever enter in any game just for items.

Good man!

In living memory, I have never left a room in any game without completely scouring it.
This makes playing crap games incredibly tedious because I can't even just rush through them.

Edit:

I'm currently on my 3rd playthrough of Deus Ex: Human Revolution, and I'm playing on the hardest difficulty and trying to get the achievement of not killing anyone.

I WILL NOT RANDOMLY THROW FRIDGES THIS TIME!

For some reason when I started my current playthrough I didn't think that killing people in the prologue would count. I hate myself for that mistake...

 

[socialmenace42]

Also Oblivion: Alchemy. No matter what class I play as I alays make sure to create a custom class where Alchemy is one of my core skills because no matter where I go I compulsively pick flowers an mushrooms...

 

[TheStatutoryApe]

The absolute worst was Just Cause 2. To start I hijacked a jet and buzzed every single map blip so that I knew where everything was (that map is fucking huge). Then I proceeded to go about attempting to complete every single city/town/base/whatever. I became intensely annoyed when I found that there are several drops through out the game in random places not within the limits of any area so I would not know whether or not I found them all. Then... then I went crazy. I got to 99% completion of one of the large cities and could not find another target or drop anywhere in the entire place. I searched for hours and hours. I went off to do other things and then came back and spent hours more. When ever I went into the area I would start searching again and wonder "What the hell is wrong with me?" at least twice before giving up and moving along again.

 

[Hamish Durie]

find 35 gnomes and chess boards in fallout 3