Parodius: Power-up ship
Pause game play, then press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [B], [A].
Parodius: Music test
Press [Up]x2, [Down]x2, [Left], [Right], [Left], [Right], [B], [A] at loading screen
Parodius: Bonus level
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
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.