Mega Man Xtreme 2/Reploid Laboratory 4

Boss weaknesses:
 * Sigma-1: M. Tornado or S. Slicer? Marine Tornado hits more easily!
 * Sigma-2: M. Tornado or S. Slicer or T. Fang? Sonic Slicer hits more easily!

Hit Sigma's lion-head eight times with a basic weapon (X buster or Z saber), and the Beast Armor will vanish temporarily. Then, hit Sigma's body with any weapon he is weak against.