and how about the option of LNP and the online thats huge there is no limite

Maple Story

I agree with Pro Evolution Soccer 6, but for PC - fanpatch FTW !!

Halo 3 or Dynasty Warriors(yep, thats right)

If online is allowed for eternity then Virtua Tennis 3

If its not then Shenmue (If i got bored of the main game i could go to one of the arcades within the game and play the origional 1986 version of outrun or play space harrier) Also in the amusement arcades i could play the fruit machines..... And if i get bored of that theres always the pubs in the game where i can play darts

Mario Kart DS hands down, I can never get sick of that game.. either that or Mario Kart Wii.. only thing separating them is the god damn blue shell!

LittleBig Planet, because pretty much any other game can be made using it

Not if youre playing solo. If theres another player(level doesnt matter cause hes got all eternity to catch up),then i could give it a thought.

For me ,it would be either Tetris or Chrono Trigger or Super Metroid

A Civilization game. That or Disgaea - endless grinding.

Something that takes a really long time.
I haven't played much of Morrowind, but that might be good. Or Oblivion.