Extreme Battle

Extreme Battle is a minigame that was introduced in the Dual Shock edition of Resident Evil 2, and later implemented in the Dreamcast and PC ports of the game; despite coming out around the same time, the Nintendo 64 version of RE2 does not include this mode. It is unlocked by completing Scenarios A and B on Normal and saving the clear file when prompted.

Gameplay
Like its predecessor, Battle Game, Extreme Battle tasks the player with surviving a long gauntlet of enemies while using a limited supply of ammunition and health supplies. Unlike its companion, though, Extreme Battle actually tells something of a (non-canon) story, in that the chosen character is racing from the Umbrella lab underground up to the Raccoon City police department, planting a series of anti-virus bombs around the RCPD's precinct to eliminate the zombie threat on the surface. Players are graded based on the amount of time they take to complete all three stages of the game.

There are three levels of difficulty, with new ones being unlocked by completing the previous ones. Items become more scarce and stronger enemies more common in higher difficulties.

Characters
Each character sports a different armament, but otherwise plays the same.
 * Leon S. Kennedy -- Handgun, Shotgun, Desert Eagle, Ink Ribbon, First-Aid Spray, Blue Herb
 * Claire Redfield -- Grenade Launcher, Flame Rounds, Acid Rounds, Ink Ribbon, First-Aid Spray, Blue Herb
 * Ada Wong -- Colt S.A.A., Submachine Gun, Bow Gun, Ink Ribbon, Mixed Herb (Ada must be unlocked by beating Extreme Battle once)
 * Chris Redfield -- Handgun, Enhanced Shotgun, Rocket Launcher, Ink Ribbon, First-Aid Spray (Chris must be unlocked by beating level 2 of Extreme Battle once).

Trivia
Chris' grunts when he is attacked are taken from Leon's sound samples from the original version of RE2, now infamously known as Resident Evil 1.5.