Nemesis

					
More PowerUps
Pause gameplay and press Up Up Down Down Left Right Left Right B A Start.
Options Mode
Pause gameplay and press Up Up Down Down Left Right Left Right A B Start.
Full Speed and Shields
Pause gameplay and press B5x A5x Start.
Destroy All OnScreen Enemies
Pause gameplay and press Up Right Down Left Up Right Down Left B A.
Expert Mode
Pause gameplay and press Up Select Down Select Left Select Right Select Select Select.
Remove Current PowerUp
Pause gameplay and press A Left A Left A Left A Left A Left.