Technically, Rage 1 was a six button fighter that only had four buttons. You got the ‘heavies’ by pushing the top two or bottom two buttons together.

Rage 2 has all six individual buttons, but if you choose, you can also push light + med together to get heavy. Further, if you prefer level-edge special moves (which is to say you hold buttons while you do stick motions; thus, “level” with the deck), you can do that, too.