

After each game, the player receives a ranking based on the total time taken to complete the scenario, and on the number of saves and special healing items used. For example, the availability of certain items may be altered. Actions taken during the first playthrough affect the second. The player has the option of starting the 'A' scenario with either of the two protagonists, resulting in a total of four different scenarios. After finishing the 'A' scenario with one protagonist, a 'B' scenario, in which the events are depicted from the other character's perspective, is unlocked. The main addition over the preceding game is the 'Zapping System', by which each of the two playable characters are confronted with different puzzles and storylines in their respective scenarios. The game uses tank controls, meaning that pressing up moves the character in the direction they face, down reverses them, and left and right rotates them, regardless of the perspective of the camera. The graphics of Resident Evil 2 are composed of real-time generated – and thus movable – polygonal character and item models, superimposed over pre-rendered backgrounds that are viewed from fixed camera angles. However, each save expends one of a limited number of ink ribbons, which the player must collect in the game world. Certain rooms contain typewriters that the player may use to save the game. These characters accompany the player in certain scenes, and occasionally become playable. Each protagonist is joined by a support partner during the course of the story. The protagonists may carry a limited number of items, and must store others in boxes placed throughout the game world, where they may later be retrieved. For example, a character will hold their stomach in pain if wounded, and will limp slowly if on the verge of death. The characters' current health can also be determined by their posture and movement speed. On the status screen, the player can check the condition of the protagonists, use medicine to heal their wounds, and assign weapons. The game's two protagonists may be equipped with firearms, but limited ammunition adds a tactical element to weapon use. The player explores a fictional city while solving puzzles and fighting monsters. As a survival horror game, Resident Evil 2 features the same basic gameplay mechanics as its predecessor, Resident Evil.
