Zoradius mini-game:
Select Extra Missions -> Boss Battle Mode and fight Vic Viper. While fighting, pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, L1, R1.
All Power-Ups, Zoradius mini-game:
Pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, L1, R1.