As a survival horror game, Resident Evil 2 features the same basic gameplay mechanics as its predecessor, Resident Evil. The player explores a fictional city while solving puzzles and fighting monsters. The game's two protagonists may be equipped with firearms, but limited ammunition adds a tactical element to weapon use. On the status screen, the player can check the condition of the protagonists, use medicine to heal their wounds, and assign weapons. The characters' current health can also be determined by their posture and movement speed. For example, a character will hold their stomach in pain if wounded, and will limp slowly if on the verge of death. 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. Each protagonist is joined by a support partner during the course of the story. These characters accompany the player in certain scenes, and occasionally become playable. Certain rooms contain typewriters that the player may use to save the game. However, each save expends one of a limited number of ink ribbons, which the player must collect in the game world. 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. 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.