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| Time attack boss mode | 100% | |
| After you defeat the big Boss by shooting him 3 times, he will hang from the tower. Shoot the chain and win the game that way to unlock time attack boss mode. | ||
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| Convert health to time | 100% | |
| Press Start to pause game play in Arcade Mode, then press Up(2), Down(2), Left, Right, Left, Right, X, Circle. The sound of a gun will confirm correct code entry. One half of a life will be converted into five extra seconds. This code can be repeated. | ||
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| Additional lives | 100% | |
| Intentionally lose the game by dying repeatedly to increase the number of lives per credit between 4 to six. | ||
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| Additional time | 100% | |
| Intentionally lose the game by allowing the timer to run out repeatedly to increase the time limit between seventy and eighty. | ||
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| Three credits | 100% | |
| After continuing the game 16 times, you will be able to increase the credits to 3 on the options screen. | ||
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| Survival boss mode | 100% | |
| After you defeat the big Boss by shooting him 3 times, he will hang from the tower. If you shoot him or the girl, they will both fall. You will win the game and unlock survival boss mode. | ||
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| Unlimited credits | 100% | |
| After continuing the game 101 times, you will be able to increase the credits to infinite on the options screen. | ||
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| Four credits | 100% | |
| After continuing the game 31 times, you will be able to increase the credits to 4 on the options screen. | ||
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| Convert time to health | 100% | |
| Press Start to pause game play in Arcade Mode, then press Circle, X, Right, Left, Right, Left, Down(2), Up(2). The sound of a gun will confirm correct code entry. Five seconds from the timer will be converted to one half of a life. This code can be repeated. | ||
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