At the title screen, press Run to start the game. While the screen is fading to black, hold Button 2. The screen will stay black as long as you hold the button. Now, press the Run button 5 times to go to level 2, 45 times for level 3, 25 times for level 4 and 100 times for level 5.
Code Effect Hold Up + I + II + Select and press Run at the title screen. Expert Mode
Code Effect Press I, II and Select and press Run at the Title Screen. Sound test
Right near the start of the first stage, you should see two enemies chasing and trying to kill a caterpillar near the bottom of the screen. Try shooting the enemies without shooting the caterpillar itself. If you did it right, you'll see a cocoon near the middle of the level and a bunch of butterflies will fly away when you reach the boss. Now, get to level 4 without losing a life, and a giant turtle will appear and act as your shield.
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