OPERATION C > CHEATS, ASSISTANCE
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Input the following codes on the title screen, when asked to press START.
North America & PAL regions
Press UP, UP, UP, UP, DOWN, DOWN, DOWN, DOWN, LEFT, LEFT, LEFT, LEFT, RIGHT, RIGHT, RIGHT, RIGHT, B, A, START.
Press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A, B, A, START.
The player will have 10 lives when starting the game or continuing after a Game Over.
Sound Test Menu: Press UP, DOWN, LEFT, RIGHT, A, B, START.
Level Select Menu (only for North America and PAL regions): Press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A, B, A, START.
The Japanese release features the level select menu by default.
Hidden Homing Gun Powerups: Approximately 2/3 of the way into the fourth stage, there is a dormant egg on the left side. It contains a Homing Gun powerup. Atop the first climb on the fifth stage, there is a facehugger that does not break out of the display tube. This tube contains another Homing Gun Powerup.
Easily Cross the Bridge: Just before the stage 3 boss, there is a gap that is very difficult to cross. Wait 20 seconds and a bridge will form over the gap, eliminating the risk of getting killed.
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