Digimon - Digital Card Battles
Digimon Rumble Arena
Legend of Dragoon
Ragnarok
Toribash
Counter-Strike
The Sims
Final Fantasy Tactics Advance (Only GBA Game I actually played)
Monster Rancher 4
Viewtiful Joe 2
Okami
Shadow of the Colossus
GunZ

WOW How did you all for get:


BIONIC COMMANDO!!!!
&
LORD: Legend of the Red Dragon!!

Doom 1 & 2
Fallout 1 & 2
Diablo 1 & 2
Quake 1 & 2
Starcraft
Descent 2
Worms series

And on and on and on... But seriously, if you don't know the first four, kindly get up from under that rock.

Lineage 2
Roblox ( i've been banned from it after i sweared at somebody who destroyed my whole map...)
Phun
Burning Sand 2
Harvest moon ( game for gameboy)
Call of duty 2

Doom 1 & 2
and Commandos 1 (and a bit 2). Especially commandos, I spent so much time on this game, sooooo much.

Diablo 2 LoD
Oblivion
WoW (Because of the community, not the game).
Also GTA SAMP.

Spyro: Year Of The Dragon
Digimon Rumble Arena
Need For Speed: Hot Pursuit.

Final Fantasy Tactics A2: Grimoire of thr Rift

A compelling storyline, and some of the best turn based battles you will ever have.

Free Rider 2:

An online game, I have gained VIP status for my sprite art.


LoZ: Link to the Past

It's so bloody fun.

Diablo 2 LoD
Shadow Of The Colossus
Okami
Toribash
Final Fantasies I, II, III, IV, VI, VIII, X, XII.

LIST TIEM!

Arcade:
Donkey Kong
Street Fighter 2/Alpha
Virtual On
Pac-Man

Atari 2600:
Big Bird's Egg Catch (AWESOME!)
Snoopy vs The Red Baron
Star Wars: The Empire Strikes Back
Pigs in Space

Atari XE:
Fight Night (the original!)
Flight Simulator
Mario Brothers

NES:
SMB 1, 2, 3
Rad Racer
Arkanoid
RBI Baseball
TMNT
Duck Tales

SNES:
F-Zero
Link to the Past

Genesis:
Sonic 1 & 2
Road Rash

PC:
Syndicate Wars (never liked the original much, but I loved this)
System Shock 1 & 2
DOOM
X-Com (UFO Enemy Unknown)

Modern:
N/N+
Portal
Toribash

Fight Night especially needs a mention. The AtariXE version is a ancestor to the modern console versions. It obviously was very different back then, but had an epic create a boxer mode. I spent many, many hours on that game.