Paralyzer attack
If you are facing a Boss or Gamma guard and you are angry; grab them, then press [Gamma] for a hurting and heroic move. This also works on Ross' robots.
Waving soldierIn challenge mode, go to time attack mode 1. Wait until the soldiers appear. Go to either side of the building. Pick up a soldier, jump, and throw him off the building. Sometimes another soldier will wave good-bye to him.
Destroying missilesPerform any kind of punch toward a missile when it is flying at you. If timed correctly, you can punch the missile and it will fly back to the soldier who shot it then blow him up.
Final levelAfter defeating the Leader, the stronghold will collapse. Pound the door two or three times and follow the path. Ignore the Gamma Elite and go directly to the place where you fought Madman and Half-Life. Wait until the boulders stop falling. Then, jump as if going out of a trouble zone. Defeat the return of Madman at the end and you are home free.