Successfully complete arcade mode on the advanced difficulty setting with Neil or Nereshkova to unlock a free editing option for Neil and Nereshkova.
Successfully complete the following levels in mission mode to unlock the corresponding bonus:
Game Shark Codes
Note: The number of ammunition will still count down to 0, but you will still have an unlimited amount of ammunition when it reaches 0.
Successfully complete arcade mode on the intermediate or higher difficulty setting to unlock new costume colors for use in character edit mode.
Successfully complete mission mode on the novice, intermediate, and advanced difficulty settings to unlock the "Sound Test" and "Movie Test" options under the options menu.