Insert the game disc into a PC compatible CD-ROM drive and look in the "Furoku " directory for several bitmap graphic image files.
Successfully complete the game one time.
Select game speed:
Accumulate more than three hours of game play.
View attack range:
Accumulate more than twelve hours of game play.
Change plane speed:
Accumulate more than forty-eight hours of game play.
An additional credit is available for each hour of game play that is accumulated.
Press L + R when "Insert Coin" appears on screen to play in arcade mode. To get unlimited continues, press L + R during game play when you are running low on lives.