The player can fly Batman throughout the city using his cape, with gliding now allowing for faster, longer sustained flights, steeper dives, and higher climbs. Batman can use some gadgets while gliding, such as batarangs or the line-launcher. The grapnel gun can now be used to instantly switch directions during a glide, as well as being fired twice while in the air to chain grappling moves together.
The game's 'FreeFlow' combat system allows for basic attacks including strikes, counters, and dodging which can be combined to keep Batman attacking while moving between enemies and avoiding being attacked himself. Basic enemies include enemies armed with shields and shock batons, while others are armed with guns which significantly damage Batman. These enemies can perform a charge and tackle attack only used by larger enemies in previous games; precision timed dodging, and a batarang can instantly defeat some charging enemies. The system adds the ability to combine attacks on prone enemies without interrupting a combo streak. Batman can counter enemy attacks and throw them into other enemies for increased damage. Batman is also capable of disarming enemies wielding items like baseball bats and using the acquired weapon on several foes before it breaks. Arkham Knight introduces "Dual Play", in which players can seamlessly switch control of Batman to one of his allies: Robin, Nightwing or Catwoman while in FreeFlow Combat, which the player enters when they have accumulated an uninterrupted combat streak. Each successful, uninterrupted attack adds to the player's combat score, which carries over between each controlled character and unlocks double-team takedowns on opponents at higher scores.
Arkham Knight introduces enemy medics who can shield enemies in electrified fields and revive unconscious ones, sword-wielding enemies, and brutes who are resistant to damage and must be stunned before they can be attacked; brutes wielding Gatling guns, tasers, and blades require additional steps to defeat. Enemies are capable of employing tactics to counter Batman's various skills, including deploying landmines, controlling hovering drones, disabling vents if Batman is found using them, and detecting his location if Batman uses Detective Vision for too long.