Idk about postal, but im havin it all over tetris.

slide it in there, cmon....slide it in... SLIDE IT!! YEARHGHH!

Actually Tetris isn't a joke. That game is every human sensation in one. XD I laugh, I cry, I scream, I orgasm all in the course of one playthrough.

Please go to church this Sunday.

Last time I got near a church I bust out into boils and started vomiting.

I would prod you to go in further, but then the threads might get kind of dull without you. Oh, well, maybe some other day.

When I hit a point of balance between the challenge of the game and my skill and the action has a nice consistency, I experience a state I call "flow". I feel powerful and peaceful.

This but it happens so rarely so I would have to go with immersion that I forget everything else. For me, a challenge is not the goal of the game but an instrumental tool to keep me engaged.

I also like it when I find stuff the developers didn't really intended which causes emergent gameplay, it doesn't necessarily have to help me but it brings a interactive creativeness to it that I like. For example, my favourite part in Mark of the Ninja was getting as many guards to kill each others by causing one of them to be terrified. Frankly, just messing with the guards was my favourite part.

Another one is to meet some really interesting, weird or unique character in a RPG.

That does indeed qualify you to be a puzzlemaster.

I did complete Professor Layton and the Curious Village, I guess that would qualify me to be a puzzle professor. I also climbed to the top of the Catherine block puzzle tower.

Have you played Catherine? I would recommend the hell out of the mini game in it Rapunzel for you. It pretty straight defeated me on level 56 or something. Great block puzzles.

I would, but I care little for the story. Seems rather dumb and over-sexualized to me. I'd rather spend my time/money on other games.

Surviving in some PvP game with ridiculous odds against me, yet coming out alive or top of scores etc.
Often makes me cackle whenever I manage that :)

Kicking someone's ass in a fighter.

Stealing your base with engineers in C&C and selling everything you worked so hard to build, then rushing in and steam rolling your remaining troops.

A really intense game of Company of Heroes.

A really tough final boss that makes you fight with every ounce of energy. Risk of Rain was the last game to make me sweat and raise my heart rate during the final boss.

Beating a game on the hardest difficulty.

Killing someone over and over in deathmatch to the point they scream at you or ragequit.

Mastering a game's mechanics, all your movements are fluid and flawless.

Beating something / overcoming something / achieving something I should not be able to yet as the game design and got rewarded for that.

Like beating Midgar Zolom in FF7 early on to gain the enemy skill beta and make things very easy later.

Or Baldur Gate where you have to choose between exp / item / alignment, you can trick by stealing / kill NPC with poison cloudkill before triggering dialogue / spell trap and gain them all

Or go against the game advice of using explosive but amassing sniper tower in Iron Brigade would beat the level easier

Using clever combination of units / abilities / kiting beat impossible monster / enemies not designed to beat at that time. Happens a lot with all mages party in many games.

immersion