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Dreamcast - Zero Gunner 2 cheats

Unlimited credits:
Each time, when you restart the game, your credits increases.
If played enough times, your available credits will be unlimited. 

Unlock Expert mode:
Finish the game in arcade or higher difficulty level
to unlock other difficulty levels. 

Unlock Replay option:
Finish the game once to unlock the "Replay" selection at the main menu. 

New shooting weapons:
Pick up all the objects you see after the planes explode. 

In-game reset:
Pause the game, hold A + B + X +Y and press Start. 

Full pause screen
Press X + Y, while paused the gameplay.