Biohazard 2 – Dreamcast

Biohazard 2 - Platform: Dreamcast

Extreme battle mode
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Complete both of either character's scenarios, then go to the 
"Special" option. 
A new "Extreme battle mode" selection will be unlocked. MARF!

Infinite Ammo
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Access the item selection screen, then press 
up, up, down, down, left, right, left, right, Right Trigger