Forum:Help in identifying a Street Fighter game...

Hey, I'm trying to let my friends know about a really kick-ass SF game that I played on a cruise ship a little while ago.. It only occurred to me a little while ago how awesome this game was. Especially compared to IV. No offense to IV, but I like 2D animation better. Anyways, the key thing about this Street Fighter game was that all the characters were divided into four groups, levels 1-4. Level 1 characters (I can only remember Evil Ryu..) would take up 4 slots. Level 2, 3 slots. Level 3, 2 slots. Level 4, 1 slot each. I seem to remember they're being some characters that I wasn't familiar with at the time, so it leads me to believe that they were from SNK or something, I'm not really sure.. But the key thing is that there were 4 levels of characters, me and my friends tracked down a 3 leveled game but it just didn't bring back any memories.. Anyways, it's quite possible I just don't remember correctly.. Any help would be much appreciated.