[TheDemonNaruto]

The first Sigma clone you fight,boss,the rest are little minions as strong as the first one but goes down easier and you fight a lot on the last level,then you fight Sigma,the hard dude of the game(except for on Normal and Hard,then there's an extra boss who adds to the story after you beat Sigma,but do easy first,trust me)

On the third to last level,you have to fight all the bosses one at a time,then run away,then fight the first Sigma clone,who stays in the air and shoots lasers,muahahahahahahah