This game is probably the single most prominent reason I hate, no, LOATHE and ABHOR Final Fantasy XIII.  This game here was linear as hell (most of the worlds were pretty much corridors), had basically the same kind of level up system (Sphere grid and Crystarium are pretty similar), and yet THIS game is great, while XIII is trash.  why?  SIDEQUESTS!  In X, you can search the world, unlock mysteries, play blitzball (even though you didn't like it, I loved it), get ultimate weapons, find hidden areas, unlock a language, and that arena was just so awesome.  

This game is linear yet with LOTS of sidequests.  

I need to play XII again. 

So we wont be seeing FFXIII on your list?

Ride ze Shoo-Puff?

Don't know why that quote suddenly popped into my head.  I just wanted to tag this thread in my Forum Buddy so I can do some updating tomorrow.  FFX is a great game and it'll probably be in my top 10.  Great choice!

#20 Dreamfall: The longest journey played on PC, released 2006

One of the last great adventure games. This game showed that 3D adventure games can work. I love the dual storyline, going back and forth between worlds. The near future world is well realized as is the fantasy world.
The game was criticized for it's combat, but that's the same as complaining about the puzzle elements in Halo. The story, characters, conversations, exploration and different settings all make this game stand out for me.

List

#21 Die Hard Trilogy 1 PSOne

 

So many reasons why I love this game, first of all it's 3 games in one and also boasts one of the best Soundtracks in gaming history!

My favourite song from the game amongst many.

20. LittleBigPlanet

I'd hazard a guess that this is my most played Playstation game, and by that I don't just mean on the PS3, but on every Sony console I've ever owned. For me to play something that much, it has to be pretty good, and LBP definitely is, despite its flaws and limitations. The levels that the game comes with are pretty standard platforming affairs, but it's the rare spectacular user created level that makes this game shine. Granted, there is a lot of utter garbage to sift through in order to find that 0.01% that are actually great (and I could be being generous with that percentage given there's millions of levels, so that would be into the hundreds), but it is more than worth it, as the best of the best levels even far outshine the levels Media Molecule created.

20. Mario Kart 64 (N64)

In my opinion the best MK ever made. Sure, later MKs had more content, but none was as much fun as MK64.

When it comes to Final Fantasy games what I can do in the end game is even more important than the main quest. I love leveling my characters to insane levels. FFX was perfect for that, I had the trio of girls with the whole sphere grid maxed out. It's so funny seeing Lulu's little moggle run up to an enemy, give him a little slap and see 99,999 damage pop-up or to Quick Attack the hell out of a giant arena monster. Also searching for ultimate weapons could keep you busy for a long while. I never was able to control those damn chocobos well enough to get the under 0 sec time to get Tidus' ultimate weapon so I forged him one using stuff I won in the arena.

It's not about content so much as balancing. This game's rubberband AI was the most egregious of any in the series (though i'll admit never playing Super Mario Kart). That said, it's the highest ranked MK on my list too, but won't come up for a bit still

My number 20 is Kirby 64

Seems like we were both PS1 demo disc junkies!