Outtrigger

Sound and movie test options:
Finish mission mode in novice, intermediate, and advanced mode

Free editing option:
Finish arcade mode in advanced mode with Neil or Nereshkova

Change outfits colors:
Finish arcade mode on the intermediate or advanced mode

Unlock Bonuses:
Finish the indicated stages to unlock bonuses:

Level - Difficulty - Bonus
3 - Advanced mode - Pipe Bomb Launcher
3 - Intermediate mode - Bonus stage
4 - Advanced mode - Icon Bomb
5 - Advanced mode - Play as Proofer
5 - Intermediate mode - Play as Scarpin
7 - Advanced mode - Bonus stage
8 - Advanced mode - DICW weapon
8 - Novice mode - Play as Commander
9 - Advanced mode - Bonus stage
10 - Advanced mode - Play as, Enemy B.A.T. weapon
11 - Advanced mode - PSG-1 weapon
11 - Intermediate mode - Play as Siba
12 - Advanced mode - Bonus stage
12 - Intermediate mode - Machine Gun
13 - Advanced mode - SPAS12 weapon
14 - Advanced mode - Bonus stage
14 - Novice mode - Play as Shinobi
15 - Advanced mode - Play as Dr. K, - Missile 2 and Salamander
15 - Novice mode - Bonus stage