Cheats Courtesy of Code Pioneer
ConsoleCheatCodes.com
Extra continues:
Intentionally fail while playing the game and you will eventually
unlock more continues per game. Sooner or later you will get unlimited
continues. You can perform this in both arcade and rescue modes.
Rescue mission:
Finish the game to unlock the bonus
rescue mission.
Trial stages:
Finish a stage in arcade mode to unlock
the corresponding trial mode stage.
Infinite handgun ammunition:
Finish arcade mode to unlock infinite
handgun ammunition, which allows you to keep firing without reloading.
Collecting Ammo Packs:
Ammo Packs for the Special Weapons are carried by the
yellow troops. Be sure to shoot them quickly and as many times
as possible.
No-Miss streaks scoring:
Every time you get 10 No-Miss Shots as part of your
streak, your score will increase by 500. For example, a 20-Streak
is 1,000, 30-Streak is 1,500, etc.