Red beam mode:
Press Right, Up, Left, Circle, Up, Circle, Circle.
Ten additional missiles:
Press X, Circle, R1, Right, Triangle, X, Triangle.
Ten additional grenades:
Press R1, X, R1, Right, Square, Right, Square.
Press R1, Triangle, L1, Left, Triangle, Circle, X.
Press Up, Left, Down, R2, Right, Square, X.
Begin game play and reach the Craterscape level. Take the extra
life located behind the pillar on the bridge at the start of the
level. After the total number of lives has increased, press Start,
Select, and use the "Quit" option. Select "Yes" to confirm to
return to the title screen. Select the "Start" and "Continue
current game" options to restart at the Craterscape level. Collect
the extra life again from the pillar and repeat this process to
accumulate as many lives as desired.