Official Game Genie Codes
| DFC2-A494 | 1 credit instead of 3--player 1
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| D4C2-A494 | 2 credits--player 1
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| D9C2-A494 | 5 credits--player 1
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| D5C2-A494 | 7 credits--player 1 |
| DBC2-A494 | 9 credits--player 1
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| DDC2-A494 | No credits--player 1
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| DFCF-DFF7 | 1 credit instead of 3--player 2
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| D4CF-DFF7 | 2 credits--player 2
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| D9CF-DFF7 | 5 credits--player 2
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| D5CF-DFF7 | 7 credits--player 2 |
| DBCF-DFF7 | 9 credits--player 2
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| DDCF-DFF7 | No credits--player 2
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| C260-67F7 | Infinite credits--both players
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| 7A64-D420 | Clock runs faster
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| ED64-D420 | Clock runs slower
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| ED64-D420 + DF64-D7F0 | Clock runs much slower
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| 8269-DF90 | Freeze clock--must switch off effects in bonus stage
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| DF6D-D7BD | 1 play per game instead of 3-- both players
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| D46D-D7BD | 2 plays per game--both players
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| D06D-D7BD | 4 plays per game--both players
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| D96D-D7BD | 5 plays per game--both players
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| D56D-D7BD | 7 plays per game--both players
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| DB6D-D7BD | 9 plays per game--both players
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| C26E-6D2D | Infinite plays--both players
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| 6DA6-6D69 | No harm from most enemies
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| C23B-A7F9 + C232-67B1 | No harm if swallowed by a monster
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| D427-6D2D | Collect 2 eggs for extra play instead of 50
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| D927-6D2D | Collect 5 eggs for extra play
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| FD27-6D2D | Collect 10 eggs for extra play
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| F927-6D2D | Collect 15 eggs for extra play
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| 4927-6D2D | Collect 25 eggs for extra play
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| 5927-6D2D | Collect 75 eggs for extra play
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| BB27-6D2D | Collect 99 eggs for extra play
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| EC6B-DFBE | Rex jumps higher
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| E66B-DFBE | Rex jumps much higher
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| EC8A-D793 | Tops jumps higher
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| E68A-D793 | Tops jumps much higher
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| EC22-DF22 | Timmy and Jamie jump higher
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| E622-DF22 | Timmy and Jamie jump much higher |
