Konami GB Collection Volume 2 – Gameboy Color

Konami GB Collection Volume 2 - Platform: Gameboy Color
 
Parodius: Power-up ship
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Pause game play, then press Up(2), Down(2), Left, 
Right, Left, Right, B, A. 

Parodius: Music test
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Press Up(2), Down(2), Left, Right, Left, Right, B, 
A at loading screen 

Parodius: Bonus level
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Locate the gap at the bottom of the screen on 
level 3 soon after entering the cave. Enter it to 
advance to a secret bonus level. 

Track And Field: Bonus effects 
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Hammer toss
Throw the hammer at maximum power at 80 degrees to hit a UFO. 
Triple jump
Land just short of the pit and a frog will appear on the screen. 
Archery
Hit the ground between the 40 and 50 yard marks in the 70 yard 
shot to see a groundhog.