Exchange a half of life for 5 seconds
 
 Pause the game and press Up(2), Down(2), Left, Right, Left, Right, 
 X, Circle. If you entered the code correctly, you will hear the 
 sound of a gun.  
 
 
 Exchange 5 seconds for half of life
 
 Pause the game and press Circle, X, Right, Left, Right, Left, Down(2), 
 Up(2). If you entered the code correctly, you will hear the sound 
 of a gun.  
 
 
 Three credits
 
 Continue the game more than 15 times to increase the credits to 
 3 under the options menu.  
 
 
 Four credits
 
 Continue the game more than 30 times to increase the credits to 
 4 under the options menu.  
 
 
 Infinite credits
 
 Continue the game more than 100 times to increase the credits to 
 "Infinite" under the options menu.  
 
 
 Extra lives
 
 Lose the game with all lives gone. Continue to do this and you will 
 increase the lives between 4-6.  
 
 
 Extra time
 
 Lose the game with timer reaching zero. Continue to do this and 
 you will increase the time between 70-80.  
 
 
 Time attack boss mode
 
 After you defeat the final Boss by shooting him three times, he 
 will hang from the tower. Shoot the chain and complete the game 
 that way to unlock time attack boss mode.
 
 
 
 Survival boss mode
 
 After you defeat the final Boss by shooting him three times, he 
 will hang from the tower. Shoot him or the girl and they will both 
 fall. You will complete the game and unlock survival boss mode.
 
 
 
 Game Shark Codez: 
 
 Master Code (Must Be On):
 EC8816A0 14465F34
 
 Infinite Credits:
 4CB1A99C 1456E7A7
 
 Infinite Health P1:
 4CB48B74 1456E6A5
 
 Infinite Time:
 4CB48BA6 1456E70C
 
 No Reload:
 4CB48B9A 1456E7A3