Honestly, Id say Mortal Kombat 2 Online for PS3. Once you play the arcade, you get 2 matches in then its as if the Game Designers are the ones controlling the computer. Ima beast at MK2 n I get smoked in that game Vs the AI

MK2 was hard as a son of a bitch.

MK3 is so hard on like t he third battle they beat the crap out of ah

On Mk2, it's as if the computer ai knew exactly what you was going to do.
You jump n they hit you with a projectile.
You go for a basic special move, they flip kick you.

To me the online was insane.
I still Jam MK2 Online via ps3 and LOVE IT!

MK II is by far the hardest (thanks Kintaro).

MK2 the hardest?....Said it once and i'll say it again,MK2 is a piece of cake once you learn the cheap tricks against the cpu....of course you must learn them first.

I remember a tip against Kintaro,stand close to him and tap HP once,Kintaro will throw his fireball and you jump kick HK to him,the fireball misses and the kick connects,repeat unitl he's dead,it's easy to do with Mileena.