Intentionally die just before entering the next level or section of
the current level. The best place to do this is when you come across
the third power plant on the first level, where destroying it will
takes you to the next level. Find where the nearest street to the
third power plant is located. There should be a pit here. Turn your
back to the pit and destroy the power plant. After it explodes wait
for approximately two seconds then jump into the pit. If done
correctly, the mission completed mission will appear followed by a
message stating that you died. When the next mission starts, you will
have no life, but will be invincible (except for falls). Note:
Although the game will continue normally, you will not be able to
save since you are considered dead.
Sites: