Regarding traversal, Nomura noted the new mechanic, called "Athletic Flow" in Japanese, was refined from the Flowmotion mechanic from Dream Drop Distance, which players felt was "a little too free... and it was kind of hard to control on their end." "Athletic Flow" allows the player to utilize the environment to access previously unreachable areas. Co-director Tai Yasue stated this mechanic was created "to try something new" and "radically change the gameplay" for the Hercules world, which led to its use in the other worlds. As a result, each world was able to have "more height, scale and sense of discovery." Situation Commands also return from previous entries, which can trigger the Keyblade transformations. Nomura revealed that Keyblade transformations were conceived as early as the development of Kingdom Hearts II: Final Mix and would be similar to Aqua's ability in Kingdom Hearts Birth by Sleep, saying, "Each Keyblade transformation is unlocked by clearing all missions in one of [the game's] worlds, and each individual world offers its own unique Keyblade transformation." He further elaborated stating there were two forms each Keyblade can take, with "multiple layers in terms of transforming" starting with one transformation and achieving the second after "successfully connect[ing] your combos". The Keyblade transformations active the various "Formchanges"–Power, Guard, Magic, and Speed– and change Sora's outfit, similarly to the "Drive Form" mechanic in Kingdom Hearts II. Various Keyblades are linked to each form; for example, the Toy Story world Keyblade actives Power Form for Sora, with the Keyblade's transformations changing into a hammer and then into a drill. There is also "Second Form", which changes Sora's battle skills rather than transform the Keyblade. Unlike previous games in the series, players are able to quickly switch between different Keyblades seamlessly during gameplay rather than from the game's equipment menu, and each Keyblade can be leveled up to increase their abilities. Shotlocks also return, which use a focus meter that can target and lock on to individual enemies with the attack depending on which Keyblade is equipped. Each world offers a specific gameplay element, such as first-person shooter "Gigas" mechs in the Toy Story world, downhill sledding in the Frozen world, and naval, underwater, and aerial combat in the Pirates of the Caribbean world, which also features numerous smaller islands at sea which can be explored. The Gummi Ship also returns as a means of travel between the different worlds