Biohazard 4 (Resident Evil 4) is a survival-action game in which Leon S. Kennedy searches for Ashley in a remote part of Spain. Combat combines shooting with close-range moves, while limited supplies make ammunition, healing items, and equipment part of the choices players face during the campaign.
Staggering enemies and using the knife
Attacks aimed at an enemy’s head or legs can stagger it, creating an opportunity to follow up with close combat. The source describes these close-range attacks as a way to conserve ammunition. A knife can also parry sudden grabs or quick thrusts, blocking the attack and creating distance without firing a weapon.
Knife durability puts a limit on relying on parries and executions. The game therefore links these actions to the condition of the knife, alongside the player’s health and available supplies. The source also describes merchants repairing daggers, restoring their reliability for later encounters.
Managing the briefcase and supplies
Weapons, ammunition, and healing supplies must fit in a briefcase with limited space. Players decide what to carry, what to keep for later, and what to sell. These choices govern which items are immediately available; the source does not specify a particular packing rule or required loadout.
Herbs can be mixed to restore stamina, and ammunition can be crafted when supplies are scarce. Together, these systems make item management part of preparing for encounters, without a stated formula for crafting or restoration.
Trading and tuning weapons
Merchants allow players to buy and sell equipment, exchange gems for special items, and adjust weapon power, rate of fire, or reload speed. The game offers more than 20 weapons, including pistols, rifles, shotguns, and explosives. These options give players different equipment to choose from, while the source does not specify exact weapon statistics or upgrade costs.
Story, puzzles, and difficulty
The story begins after Ashley, the US president’s daughter, is kidnapped. Leon, a survivor of Raccoon City and an agent, is sent to find her. His search takes him to Spain, where he encounters mind-controlled villagers, mutated creatures, and a parasitic cult. Story mode also includes puzzles, though their rules are not detailed in the source.
The source states that choices throughout the story affect its multiple endings. It also describes several difficulty settings, allowing players to select a challenge level. Touchscreen controls are listed, along with mobile-optimized graphics and sound; the source does not give technical specifications for those features.