What's up with the awful format? I can't edit it.
Update: Fixed it through Word.
Tony hawk underground (THUG!) Best skate boarding game ever.
Super Smash Brother brawl. Best party game
Xenosaga Series 1-3 (come on their one game lol)
Tekken 6- My favorite fighter so far.
Pro Evo 6 PS2
Final Fantasy X+X2 ps2 (IT'S ONE GAME! :P)
Wipeout HD/Fury (also one game) PS3
Final Fantasy 7
Mario Party - Extremely fun in groups
Smash Bros Brawl - Same as above
Starhawk - It's not released yet, but based on the beta, it's worthy to be on this list.
Can't really think of another game that I could play forever
Final Fantasy VI
Star Ocean Till the End of Time
Devil May Cry 3
Breath of Fire II
or7 these 2offer more courses modes etc
timesplitters 3 this fps has alot of modes ai in all modes a custom mapmaker you can even make custom missions
top gear3000 this snes racer is just fun if you have an adapter you can play 4 players
mario party 2 this game is fun lots of the classic mini games from mp1 and then some
zombies ate my nieghbors 45 levels of hel await you from zombies plants aliens to spiders this f gAme offers 2 player coop
items range from waterguns plates soda forks to hazookas
nascar2011 its nascar crAshes haha 43 plus drivers from dale earnhardt jr to jeff gordon this title has all The new paint schemes drivers etc
Super Smash Bros Brawl
Mario Kart Wii
Wii Sports Resort
Animal Crossing: City Folk
Advance Wars: Dual Strike
Earthbound (already played it through about 40-50 times, I can do it more)
skate 2 (love just playing around in thie game, great way to mindlessly pass the time in the same area just seeing what I can do)
Rockband 3 (my go to party game)
LBP2 (another game that as long as I have internet I can screw around on endlessly)