The First Roller Coaster Tycoon *dodges tomatoes* besause not only is it addicting & fun, it helped me figure out my career path: Roller Coaster designer.

The Legend of Zelda: Ocarina of Time, otherwise known as Perfection Incarnated.

Runner ups:

The Legend of Zelda: Majora's Mask
The Legend of Zelda: Twilight Princess
Super Mario 64
Metal Gear Solid
Metal Gear Solid 2: Sons of Liberty
Metal Gear Solid 3: Snake Eater
Age of Mythology

If I posted mine, you guys would think I'm a joke. One of them is under 70%.

Bubble Bobble (arcade version) is the game I've had most fun on.

Simplistic
Loads of fun
First game I ever played 2 player Vs on instead of taking turns
catchy music
My high score of 9,999,990 :P

Earthbound. I grew up with this game and probably have beaten it over 20+ times. I dont have a Snes anymore, and emulators dont do the nostalgia justice so Im waiting for VC.

Wolfenstein Enemy Territory: Although it is dying now, it is a great game that makes you play as a team. I have played it for like 4 or 5 years now and it never gets old with so many mods/maps and genuine balanced gameplay. I hate seeing it slowly die now though. I remember my clan used to have matches every saturday, every saturday, for 2 years straight.

There's about 5 that compete. I'd guess the answer is:

Chess Master

Why: simple to learn, incredibly complex and difficult to master. 

^Chess Master?

I think you have the most unique gaming taste on the site, even more so than mine.

RPG - Earthbound
Platformer - Super Mario Galaxy
Action - Zelda, OoT, LttP, and TP

Bod is also in the lead for Time Magazine's Man of the year award.

And I think Nobel Peace Prize.

How lucky we all are to have bod amongst us.

Such a hard choice to make, its a toss up between:
1: NiGHTS/Christmas NiGHTS
2: Sega Rally(I played this SO much trying to beat the times in SSM)
3: Unreal Tourney(The first 1)
4: Monty Mole(Speccy)
5: Currah Microspeech(I was 8 and making my speccy swear was awesome)