User blog comment:PlantyThePottedPlant/Random Topic Blogging III: Blog Harder/@comment-3473686-20140920212516/@comment-1647442-20140920222401

it's just a standard fighting game; use the joystick to move and the a and b buttons to use your attacks (facing/moving a certain direction while pressing a button will let you use different attacks)

the percentages stand for damage. there's no damage limit, but the more you take, the further you'll fly when hit. you lose a life (or point, in time matches) when you fall off the screen. up+b is generally a move used for recovery, to get back on the stage before you fall off.

it's pretty straightforward, you can probably figure it out by playing a few low-level cpu enemies