(1) It seems that you could jump in this game, but I cannot figure out how to do it exactly. Stay on the ground at the bottom of the screen, and then go up, sometimes you would going up very fast with a sound. Pressing down seems to got somthing to do with this.

I wish to know how to perform the jump and how to control how far up you jump.
(2) According to the game manual (PS2) the final boss is within the wall?!? It seems that you have to punch the wall to reveal him before you could hurt him. Could anyone provide more deails?
(3) Also according to the game manual (PS2), if you clear the game without firing a missle you got a special bonus, any more details?
(4) Sometime couldn't punch an enemy even you got very close, why?