Successfully complete the indicated task to unlock the corresponding court:

Backstreet: After Bridget (Wendy) joins the party in Story mode, go back to her stage. Talk to the enemies near the athletic field, then defeat them.
Lake Garden: After Amorette (Rosetta) joins the party in Story mode, go back to her stage. Talk to the driver of the limousine, then defeat him.
Theme Park: After Troy (Tiger) joins the party in Story mode, go back to his stage. Talk to the little girl near the entrance, then defeat her.

Defeat the indicated character to unlock the corresponding course:

Autumn Pagoda: Defeat Alice.
Central Golf Square: Defeat Malachy.
Dino Park: Defeat Lee.
El Andes: Defeat Mifune.
Fortress Yard: Defeat Lee.
Gamelan Island Resort: Defeat Lauryn.
Golden Desert: Defeat Montcalm.
Michinoku Pass: Defeat Frau Ada.
Olive Coast: Defeat Frau Ada.
Royal And Links: Defeat Lauryn.

Successfully complete all Arena missions, then use the following combinations with the "Customize Armor" option:

Fleet: Helm of Swiftness, Leather Jerkin, Bone Shaffron, Leather Drape, Leather Crupper
Guardian: Chain Coif, Cuirass of Heroes, Chain Shaffron, Faceted Peytral, Chain Crupper

Successfully complete Arcade mode to unlock Boss Attack mode.

Successfully complete the indicated task to earn the corresponding medal:

Air Burner: Destroy more than six enemy air units with an AA gun or AA missile launcher.
Air Frightener: Destroy all enemy air units in a certain number of cycles.
Air Keeper: Have no air units lost.
Bohemian Pacifier: Destroy more than ten enemy units with light or heavy artillery.
Bombing Master: Destroy more than three enemy units with bombers.
Demon Of The Sea: Destroy more than three enemy units with submarines.
Exceptional Marksman: Destroy more than six enemy units with long-range units.

At the title screen, press L, R, Left, Right, Square, Circle, X, Triangle to unlock Situation 8.

Find a location that contains life recharge power-up above a lava bed. Intentionally lose almost all your life. Jump into the lava and simultaneously use the life power-up to resume game play at the next level.

Locate the area on level 1 with the stars that mark completion of the level. Use the helicopter or spring pads to enter a hidden room in the ceiling to collect all the weapons and remotes.