Use more than 15 Credits and you can increase the credits up to 3 in the ''Options'' mode. Use more than 30 Credits and you can increase the credits up to 4 in the ''Options'' mode. Use more than 100 Credits and you can increase the credits up to Infinite in the ''Options'' mode.
Continue to lose the game by running out of lives. You can increase the lives up to 8 in the ''Options'' mode.
Get a grade of S or better in the Indoor Shooting Range to unlock the Real-Time Window. Turn it on in Extra Options. This places and locks the scope view in the upper-left corner of the screen.