Unlock All Monsters

While at the Main Menu, press L and R at the same time to display the code entry screen.  Then, enter 141421 as a code.

Unlock One Hit Destroys a Building

While at the Main Menu, press L and R at the same time to display the code entry screen.  Then, enter 071767 as a code.

Unlock Invincibility to Military Attacks

While at the Main Menu, press L and R at the same time to display the code entry screen.  Then, enter 986960 as a code.

View Opening Theme

While at the Main Menu, press L and R at the same time to display the code entry screen.  Then, enter 667300 as a code.

View Ending Theme

While at the Main Menu, press L and R at the same time to display the code entry screen.  Then, enter 667301 as a code.

View Credits

While at the Main Menu, press L and R at the same time to display the code entry screen.  Then, enter 667302 as a code.

View Game Version

While at the Main Menu, press L and R at the same time to display the code entry screen.  Then, enter 314159 as a code.