The Kingdom Hearts games contain elements of both action

The Kingdom Hearts games contain elements of both action and role-playing video games. The games are driven by a linear progression from one story event to the next, usually shown in the form of a cutscene, though there are numerous side quests available that provide bonus benefits to the characters. In most games, the player primarily controls the principal protagonist of the series, Sora. Sora is usually accompanied by Donald Duck and Goofy, Cosplay Costumes who are artificial intelligence-controlled non-playable characters that aid Sora in battle. In the first and third game, their behavior can be altered to suit different combat objectives. The games feature real-time combat that incorporates physical attacks, magic, and summonings, though each game handles battles differently. The game also allows for items to be used on the field of battle to heal oneself or one's party members.

Gummi Ships are another common element of the series, which serve as the main mode of transportation between worlds in the games. The gameplay for the Gummi Ship sections is more akin to a rail shooter. Because it received negative criticism in the first game, it was modified in the third title.[90] Most games also feature a journal which is accessible from Kingdom Hearts Costumes the main menu. This journal keeps track of information regarding the story, characters, enemies, and locations. In the first three games, the journal is kept by Jiminy Cricket, who was appointed by Queen Minnie as the royal chronicler.[91] In 358/2 Days, Birth by Sleep and Dream Drop Distance, the main characters write their own journal entries.

The games are influenced by their parent franchise, Final Fantasy,[92] and carry its gameplay elements over into their own action-based, hack-and-slash system. Like many traditional role-playing games, Kingdom Hearts features an experience point system which determines character development. As enemies are defeated, the player gains experience which culminates in a "level-up", where the characters grow stronger and gain access to new abilities.[93] The amount of experience is shared with all party members and each character grows stronger as experience is gained.