Zoradius mini-game:

Select "Extra Missions", "Boss Battle mode", and fight Vic Viper. Pause the game when fighting Leo, then press Up(2), Down(2), Left, Right, Left, Right, L1, R1. If you entered the code correctly, you will hear a sound. The Zoradius mini-game will now be unlocked when you return to the "Extra Missions" screen.

All power-ups in Zoradius mini-game:

Pause the game during Zoradius, then press Up(2), Down(2), Left, Right, Left, Right, L1, R1.